Add null check in WriteLiteral

src/Microsoft.AspNetCore.Mvc.Razor/RazorPageBase.cs

@@ -413,6 +413,11 @@ namespace Microsoft.AspNetCore.Mvc.Razor
         /// <param name="value">The <see cref="object"/> to write.</param>
         public virtual void WriteLiteral(object value)
         {
+            if (value == null)
+            {
+                return;
+            }
+
             WriteLiteral(value.ToString());
         }
 

test/Microsoft.AspNetCore.Mvc.Razor.Test/RazorPageTest.cs

@@ -1463,6 +1463,21 @@ namespace Microsoft.AspNetCore.Mvc.Razor
             Assert.Same(defaultWriter, page.ViewContext.Writer);
         }
 
+        [Fact]
+        public void WriteLiteral_NullValue_DoesNothing()
+        {
+            // Arrange
+            var page = CreatePage(p => { });
+            var defaultWriter = new StringWriter();
+            page.ViewContext.Writer = defaultWriter;
+
+            // Act
+            page.WriteLiteral((object)null);
+
+            // Assert - does not throw
+            Assert.Empty(defaultWriter.ToString());
+        }
+
         [Fact]
         public void WriteLiteral_BuffersResultToPushedWriter()
         {