disabling ssr causes error in react router

runs-msbuild.bat

@@ -17,7 +17,7 @@ for %%s in (
 )
 
 :notfound
-echo Could not find MSBuild.exe. Make sure Visual Studio 2017 is installed and try again.
+echo Could not find MSBuild.exe. Make sure Visual Studio 2019 is installed and try again.
 
 :done
 pause

src/React.Core/JavaScriptEngineFactory.cs

@@ -139,8 +139,8 @@ protected virtual void InitialiseEngine(IJsEngine engine)
 			LoadUserScripts(engine);
 			if (!_config.LoadReact && _scriptLoadException == null)
 			{
-				// We expect to user to have loaded their own version of React in the scripts that
-				// were loaded above, let's ensure that's the case.
+				// We expect the user to have loaded their own version of React in the scripts that
+				// were loaded above, let's ensure that's the case. 
 				EnsureReactLoaded(engine);
 			}
 		}

src/React.Core/Resources/babel-legacy/package.json

@@ -13,7 +13,7 @@
     "babel-preset-stage-0": "6.24.1",
     "babel-standalone": "6.26.0",
     "webpack": "4.33.0",
-    "webpack-cli": "3.3.2"
+    "webpack-cli": "3.3.3"
   },
   "author": "",
   "license": "MIT"

src/React.Core/package.json

@@ -12,6 +12,6 @@
     "react": "16.8.6",
     "react-dom": "16.8.6",
     "webpack": "4.33.0",
-    "webpack-cli": "3.3.2"
+    "webpack-cli": "3.3.3"
   }
 }

src/React.Router/ReactRouterFunctions.cs

@@ -9,8 +9,10 @@ public class ReactRouterFunctions : RenderFunctionsBase
 	{
 		/// <summary>
 		/// The returned react router context, as a JSON string
+		/// A default value wards off deserialization exceptions
+		/// when server side rendering is disabled
 		/// </summary>
-		public string ReactRouterContext { get; private set; }
+		public string ReactRouterContext { get; private set; } = "{}";
 
 		/// <summary>
 		/// Implementation of PreRender

src/React.Sample.Webpack.CoreMvc/Views/Home/Index.cshtml

@@ -15,7 +15,7 @@
 @Html.ReactRouter("RootComponent", new { initialComments = Model.Comments, page = Model.Page }, renderFunctions: chainedFunctions)
 @{
 	ViewBag.ServerStyles = styledComponentsFunctions.RenderedStyles + reactJssFunctions.RenderedStyles;
-	ViewBag.HelmetTitle = helmetFunctions.RenderedHelmet.GetValueOrDefault("title");
+	ViewBag.HelmetTitle = helmetFunctions.RenderedHelmet?.GetValueOrDefault("title");
 }
 <script src="/dist/runtime.js"></script>
 <script src="/dist/vendor.js"></script>

src/React.Sample.Webpack.CoreMvc/package.json

@@ -27,6 +27,6 @@
     "babel-loader": "8.0.5",
     "babel-runtime": "6.26.0",
     "webpack": "4.33.0",
-    "webpack-cli": "3.3.2"
+    "webpack-cli": "3.3.3"
   }
 }