From f35deb71f935832276f36d61d597fb2c37357f85 Mon Sep 17 00:00:00 2001
From: Pranav K <prkrishn@hotmail.com>
Date: Mon, 7 May 2018 10:45:54 -0700
Subject: [PATCH] Prevent KeyNotFound when logging

---
 .../Internal/MvcCoreLoggerExtensions.cs                         | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Microsoft.AspNetCore.Mvc.Core/Internal/MvcCoreLoggerExtensions.cs b/src/Microsoft.AspNetCore.Mvc.Core/Internal/MvcCoreLoggerExtensions.cs
index 0cee994b44..36221ff1c9 100644
--- a/src/Microsoft.AspNetCore.Mvc.Core/Internal/MvcCoreLoggerExtensions.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Core/Internal/MvcCoreLoggerExtensions.cs
@@ -695,7 +695,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
                         stringBuilder.Append($"{routeKeys[i]} = \"{routeValues[i]}\", ");
                     }
                 }
-                if (action.RouteValues["page"] != null)
+                if (action.RouteValues.TryGetValue("page", out var page) && page != null)
                 {
                     _pageExecuting(logger, stringBuilder.ToString(), action.DisplayName, null);
                 }