We must use a CefRefPtr<> here also, otherwise the SchemeHandlerWrapper instance will have been deallocated sometimes, which is a Very Bad Idea<™> if we still expect it to be able to be used...

Author: perlun

CefSharp/SchemeHandlerResponse.cpp

@@ -5,6 +5,6 @@ namespace CefSharp
 {
     void SchemeHandlerResponse::OnRequestCompleted()
     {
-        _schemeHandlerWrapper->ProcessRequestCallback(this);
+        _schemeHandlerWrapper->get()->ProcessRequestCallback(this);
     }
 }

CefSharp/SchemeHandlerResponse.h

@@ -14,7 +14,7 @@ namespace CefSharp
     public ref class SchemeHandlerResponse
     {
     internal:
-        SchemeHandlerWrapper* _schemeHandlerWrapper;
+        CefRefPtr<SchemeHandlerWrapper>* _schemeHandlerWrapper;
         void OnRequestCompleted();
 
     public:
@@ -28,7 +28,12 @@ namespace CefSharp
 
         SchemeHandlerResponse(SchemeHandlerWrapper* schemeHandlerWrapper)
         {
-            _schemeHandlerWrapper = schemeHandlerWrapper;
+            _schemeHandlerWrapper = new CefRefPtr<SchemeHandlerWrapper>(schemeHandlerWrapper);
+        }
+
+        void ReleaseSchemeHandlerWrapper()
+        {
+            delete _schemeHandlerWrapper;
         }
     };
 };

CefSharp/SchemeHandlerWrapper.cpp

@@ -56,6 +56,10 @@ namespace CefSharp
         _headers = ToHeaderMap(response->ResponseHeaders);
 
         _callback->HeadersAvailable();
+
+        // Must be done AFTER CEF has been allowed to consume the headers etc. After this call is made, the SchemeHandlerWrapper
+        // instance has likely been deallocated.
+        response->ReleaseSchemeHandlerWrapper();
     }
 
     void SchemeHandlerWrapper::GetResponseHeaders(CefRefPtr<CefResponse> response, int64& response_length, CefString& redirectUrl)