diff --git a/cef1/libcef/browser_impl.cc b/cef1/libcef/browser_impl.cc
index 025a4439d..99fa1fd8f 100644
--- a/cef1/libcef/browser_impl.cc
+++ b/cef1/libcef/browser_impl.cc
@@ -783,9 +783,11 @@ void CefBrowserImpl::UIT_DestroyBrowser() {
 
   main_frame_ = NULL;
 
-  // Delete the proxy on the IO thread.
-  CefThread::DeleteSoon(CefThread::IO, FROM_HERE,
-      request_context_proxy_.release());
+  if (request_context_proxy_.get()) {
+    // Delete the proxy on the IO thread.
+    CefThread::DeleteSoon(CefThread::IO, FROM_HERE,
+        request_context_proxy_.release());
+  }
 
   // Remove the reference added in UIT_CreateBrowser().
   Release();