diff --git a/src/Microsoft.AspNetCore.Mvc.Razor.Extensions/PageDirective.cs b/src/Microsoft.AspNetCore.Mvc.Razor.Extensions/PageDirective.cs
index 48db33bc17..014587d2c1 100644
--- a/src/Microsoft.AspNetCore.Mvc.Razor.Extensions/PageDirective.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Razor.Extensions/PageDirective.cs
@@ -67,10 +67,15 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Extensions
 
         private static string TrimQuotes(string content)
         {
-            Debug.Assert(content.StartsWith("\"", StringComparison.Ordinal));
-            Debug.Assert(content.EndsWith("\"", StringComparison.Ordinal));
+            if (content.Length >= 2 &&
+                content.StartsWith("\"", StringComparison.Ordinal) &&
+                content.EndsWith("\"", StringComparison.Ordinal))
+            {
+                return content.Substring(1, content.Length - 2);
+            }
 
-            return content.Substring(1, content.Length - 2);
+            // The extensible directive system handed us invalid content. There's already an error logged.
+            return null;
         }
 
         private class Visitor : RazorIRNodeWalker
diff --git a/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/IntegrationTests/CodeGenerationIntegrationTest.cs b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/IntegrationTests/CodeGenerationIntegrationTest.cs
index a195666fad..b434d7591f 100644
--- a/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/IntegrationTests/CodeGenerationIntegrationTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/IntegrationTests/CodeGenerationIntegrationTest.cs
@@ -24,7 +24,22 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Extensions.IntegrationTests
         private static readonly RazorSourceDocument DefaultImports = MvcRazorTemplateEngine.GetDefaultImports();
 
         #region Runtime
-        
+
+        [Fact]
+        public void MalformedPageDirective_Runtime()
+        {
+            // Arrange
+            var engine = CreateRuntimeEngine();
+            var document = CreateCodeDocument();
+
+            // Act
+            engine.Process(document);
+
+            // Assert
+            AssertIRMatchesBaseline(document.GetIRDocument());
+            AssertCSharpDocumentMatchesBaseline(document.GetCSharpDocument());
+        }
+
         [Fact]
         public void Basic_Runtime()
         {
@@ -192,6 +207,22 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Extensions.IntegrationTests
         #endregion
 
         #region DesignTime
+
+        [Fact]
+        public void MalformedPageDirective_DesignTime()
+        {
+            // Arrange
+            var engine = CreateDesignTimeEngine();
+            var document = CreateCodeDocument();
+
+            // Act
+            engine.Process(document);
+
+            // Assert
+            AssertIRMatchesBaseline(document.GetIRDocument());
+            AssertCSharpDocumentMatchesBaseline(document.GetCSharpDocument());
+        }
+
         [Fact]
         public void Basic_DesignTime()
         {
diff --git a/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/PageDirectiveTest.cs b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/PageDirectiveTest.cs
index 580651bdc2..f94bbf8559 100644
--- a/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/PageDirectiveTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/PageDirectiveTest.cs
@@ -9,6 +9,25 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Extensions
 {
     public class PageDirectiveTest
     {
+        [Fact]
+        public void TryGetPageDirective_CanHandleMalformedPageDirectives()
+        {
+            // Arrange
+            var content = "@page \"";
+            var sourceDocument = RazorSourceDocument.Create(content, "file");
+            var codeDocument = RazorCodeDocument.Create(sourceDocument);
+            var engine = CreateEngine();
+            var irDocument = CreateIRDocument(engine, codeDocument);
+
+            // Act
+            var result = PageDirective.TryGetPageDirective(irDocument, out var pageDirective);
+
+            // Assert
+            Assert.True(result);
+            Assert.Null(pageDirective.RouteTemplate);
+            Assert.Null(pageDirective.PageName);
+        }
+
         [Fact]
         public void TryGetPageDirective_ReturnsFalse_IfPageDoesNotHaveDirective()
         {
diff --git a/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective.cshtml b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective.cshtml
new file mode 100644
index 0000000000..9b4f9d5559
--- /dev/null
+++ b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective.cshtml
@@ -0,0 +1,4 @@
+@page "foo
+
+<h1>About Us</h1>
+<p>We are awesome.</p>
\ No newline at end of file
diff --git a/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_DesignTime.codegen.cs b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_DesignTime.codegen.cs
new file mode 100644
index 0000000000..26ffa461cd
--- /dev/null
+++ b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_DesignTime.codegen.cs
@@ -0,0 +1,41 @@
+namespace AspNetCore
+{
+    #line hidden
+    using TModel = global::System.Object;
+    using System;
+    using System.Threading.Tasks;
+    using System.Linq;
+    using System.Collections.Generic;
+    using Microsoft.AspNetCore.Mvc;
+    using Microsoft.AspNetCore.Mvc.Rendering;
+    using Microsoft.AspNetCore.Mvc.ViewFeatures;
+    public class TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml : global::Microsoft.AspNetCore.Mvc.RazorPages.Page
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        ((System.Action)(() => {
+global::System.Object __typeHelper = "foo;
+        }
+        ))();
+        }
+        #pragma warning restore 219
+        private static System.Object __o = null;
+        #pragma warning disable 1998
+        public async override global::System.Threading.Tasks.Task ExecuteAsync()
+        {
+        }
+        #pragma warning restore 1998
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.ViewFeatures.IModelExpressionProvider ModelExpressionProvider { get; private set; }
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.IUrlHelper Url { get; private set; }
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.IViewComponentHelper Component { get; private set; }
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.Rendering.IJsonHelper Json { get; private set; }
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml> Html { get; private set; }
+        public global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml> ViewData => (global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml>)PageContext?.ViewData;
+        public TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml Model => ViewData.Model;
+    }
+}
diff --git a/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_DesignTime.ir.txt b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_DesignTime.ir.txt
new file mode 100644
index 0000000000..a8b90ab1ff
--- /dev/null
+++ b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_DesignTime.ir.txt
@@ -0,0 +1,56 @@
+Document - 
+    Checksum - 
+    NamespaceDeclaration -  - AspNetCore
+        UsingStatement -  - TModel = global::System.Object
+        UsingStatement - (1:0,1 [12] ) - System
+        UsingStatement -  - System.Threading.Tasks
+        UsingStatement - (16:1,1 [17] ) - System.Linq
+        UsingStatement - (36:2,1 [32] ) - System.Collections.Generic
+        UsingStatement - (71:3,1 [30] ) - Microsoft.AspNetCore.Mvc
+        UsingStatement - (104:4,1 [40] ) - Microsoft.AspNetCore.Mvc.Rendering
+        UsingStatement - (147:5,1 [43] ) - Microsoft.AspNetCore.Mvc.ViewFeatures
+        ClassDeclaration -  - public - TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml - global::Microsoft.AspNetCore.Mvc.RazorPages.Page - 
+            DirectiveTokenHelper - 
+                CSharpStatement - 
+                    RazorIRToken -  - CSharp - #pragma warning disable 219
+                CSharpStatement - 
+                    RazorIRToken -  - CSharp - private void __RazorDirectiveTokenHelpers__() {
+                DirectiveToken - (200:6,8 [62] ) - global::Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<TModel>
+                DirectiveToken - (263:6,71 [4] ) - Html
+                DirectiveToken - (277:7,8 [54] ) - global::Microsoft.AspNetCore.Mvc.Rendering.IJsonHelper
+                DirectiveToken - (332:7,63 [4] ) - Json
+                DirectiveToken - (346:8,8 [53] ) - global::Microsoft.AspNetCore.Mvc.IViewComponentHelper
+                DirectiveToken - (400:8,62 [9] ) - Component
+                DirectiveToken - (419:9,8 [43] ) - global::Microsoft.AspNetCore.Mvc.IUrlHelper
+                DirectiveToken - (463:9,52 [3] ) - Url
+                DirectiveToken - (476:10,8 [70] ) - global::Microsoft.AspNetCore.Mvc.ViewFeatures.IModelExpressionProvider
+                DirectiveToken - (547:10,79 [23] ) - ModelExpressionProvider
+                DirectiveToken - (586:11,14 [96] ) - Microsoft.AspNetCore.Mvc.Razor.TagHelpers.UrlResolutionTagHelper, Microsoft.AspNetCore.Mvc.Razor
+                DirectiveToken - (698:12,14 [87] ) - Microsoft.AspNetCore.Mvc.Razor.TagHelpers.HeadTagHelper, Microsoft.AspNetCore.Mvc.Razor
+                DirectiveToken - (801:13,14 [87] ) - Microsoft.AspNetCore.Mvc.Razor.TagHelpers.BodyTagHelper, Microsoft.AspNetCore.Mvc.Razor
+                DirectiveToken - (6:0,6 [4] MalformedPageDirective.cshtml) - "foo
+                CSharpStatement - 
+                    RazorIRToken -  - CSharp - }
+                CSharpStatement - 
+                    RazorIRToken -  - CSharp - #pragma warning restore 219
+            CSharpStatement - 
+                RazorIRToken -  - CSharp - private static System.Object __o = null;
+            RazorMethodDeclaration -  - public - async, override - global::System.Threading.Tasks.Task - ExecuteAsync
+                HtmlContent - (12:1,0 [43] MalformedPageDirective.cshtml)
+                    RazorIRToken - (12:1,0 [2] MalformedPageDirective.cshtml) - Html - \n
+                    RazorIRToken - (14:2,0 [4] MalformedPageDirective.cshtml) - Html - <h1>
+                    RazorIRToken - (18:2,4 [8] MalformedPageDirective.cshtml) - Html - About Us
+                    RazorIRToken - (26:2,12 [5] MalformedPageDirective.cshtml) - Html - </h1>
+                    RazorIRToken - (31:2,17 [2] MalformedPageDirective.cshtml) - Html - \n
+                    RazorIRToken - (33:3,0 [3] MalformedPageDirective.cshtml) - Html - <p>
+                    RazorIRToken - (36:3,3 [15] MalformedPageDirective.cshtml) - Html - We are awesome.
+                    RazorIRToken - (51:3,18 [4] MalformedPageDirective.cshtml) - Html - </p>
+            InjectDirective - 
+            InjectDirective - 
+            InjectDirective - 
+            InjectDirective - 
+            InjectDirective - 
+            CSharpStatement - 
+                RazorIRToken -  - CSharp - public global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml> ViewData => (global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml>)PageContext?.ViewData;
+            CSharpStatement - 
+                RazorIRToken -  - CSharp - public TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml Model => ViewData.Model;
diff --git a/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_Runtime.codegen.cs b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_Runtime.codegen.cs
new file mode 100644
index 0000000000..77f9668a85
--- /dev/null
+++ b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_Runtime.codegen.cs
@@ -0,0 +1,35 @@
+#pragma checksum "TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective.cshtml" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "5a9ff8440150c6746e4a8ba63bc633ea84930405"
+namespace AspNetCore
+{
+    #line hidden
+    using System;
+    using System.Threading.Tasks;
+    using System.Linq;
+    using System.Collections.Generic;
+    using Microsoft.AspNetCore.Mvc;
+    using Microsoft.AspNetCore.Mvc.Rendering;
+    using Microsoft.AspNetCore.Mvc.ViewFeatures;
+    public class TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml : global::Microsoft.AspNetCore.Mvc.RazorPages.Page
+    {
+        #pragma warning disable 1998
+        public async override global::System.Threading.Tasks.Task ExecuteAsync()
+        {
+            BeginContext(12, 43, true);
+            WriteLiteral("\r\n<h1>About Us</h1>\r\n<p>We are awesome.</p>");
+            EndContext();
+        }
+        #pragma warning restore 1998
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.ViewFeatures.IModelExpressionProvider ModelExpressionProvider { get; private set; }
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.IUrlHelper Url { get; private set; }
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.IViewComponentHelper Component { get; private set; }
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.Rendering.IJsonHelper Json { get; private set; }
+        [global::Microsoft.AspNetCore.Mvc.Razor.Internal.RazorInjectAttribute]
+        public global::Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml> Html { get; private set; }
+        public global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml> ViewData => (global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml>)PageContext?.ViewData;
+        public TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml Model => ViewData.Model;
+    }
+}
diff --git a/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_Runtime.ir.txt b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_Runtime.ir.txt
new file mode 100644
index 0000000000..4553832fcd
--- /dev/null
+++ b/test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/TestFiles/IntegrationTests/CodeGenerationIntegrationTest/MalformedPageDirective_Runtime.ir.txt
@@ -0,0 +1,34 @@
+Document - 
+    Checksum - 
+    NamespaceDeclaration -  - AspNetCore
+        UsingStatement - (1:0,1 [14] ) - System
+        UsingStatement -  - System.Threading.Tasks
+        UsingStatement - (16:1,1 [19] ) - System.Linq
+        UsingStatement - (36:2,1 [34] ) - System.Collections.Generic
+        UsingStatement - (71:3,1 [32] ) - Microsoft.AspNetCore.Mvc
+        UsingStatement - (104:4,1 [42] ) - Microsoft.AspNetCore.Mvc.Rendering
+        UsingStatement - (147:5,1 [45] ) - Microsoft.AspNetCore.Mvc.ViewFeatures
+        ClassDeclaration -  - public - TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml - global::Microsoft.AspNetCore.Mvc.RazorPages.Page - 
+            RazorMethodDeclaration -  - public - async, override - global::System.Threading.Tasks.Task - ExecuteAsync
+                CSharpStatement - 
+                    RazorIRToken -  - CSharp - BeginContext(12, 43, true);
+                HtmlContent - (12:1,0 [43] MalformedPageDirective.cshtml)
+                    RazorIRToken - (12:1,0 [2] MalformedPageDirective.cshtml) - Html - \n
+                    RazorIRToken - (14:2,0 [4] MalformedPageDirective.cshtml) - Html - <h1>
+                    RazorIRToken - (18:2,4 [8] MalformedPageDirective.cshtml) - Html - About Us
+                    RazorIRToken - (26:2,12 [5] MalformedPageDirective.cshtml) - Html - </h1>
+                    RazorIRToken - (31:2,17 [2] MalformedPageDirective.cshtml) - Html - \n
+                    RazorIRToken - (33:3,0 [3] MalformedPageDirective.cshtml) - Html - <p>
+                    RazorIRToken - (36:3,3 [15] MalformedPageDirective.cshtml) - Html - We are awesome.
+                    RazorIRToken - (51:3,18 [4] MalformedPageDirective.cshtml) - Html - </p>
+                CSharpStatement - 
+                    RazorIRToken -  - CSharp - EndContext();
+            InjectDirective - 
+            InjectDirective - 
+            InjectDirective - 
+            InjectDirective - 
+            InjectDirective - 
+            CSharpStatement - 
+                RazorIRToken -  - CSharp - public global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml> ViewData => (global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml>)PageContext?.ViewData;
+            CSharpStatement - 
+                RazorIRToken -  - CSharp - public TestFiles_IntegrationTests_CodeGenerationIntegrationTest_MalformedPageDirective_cshtml Model => ViewData.Model;