diff --git a/mozilla/netwerk/cache/src/nsDiskCacheDevice.cpp b/mozilla/netwerk/cache/src/nsDiskCacheDevice.cpp
index 7cff1baf85b..d2450b109c8 100644
--- a/mozilla/netwerk/cache/src/nsDiskCacheDevice.cpp
+++ b/mozilla/netwerk/cache/src/nsDiskCacheDevice.cpp
@@ -277,7 +277,8 @@ nsDiskCacheDevice::Init()
     nsresult rv;
 
     NS_ENSURE_TRUE(!mInitialized, NS_ERROR_FAILURE);
-    
+   
+    if (!mCacheDirectory) return NS_ERROR_FAILURE;
     rv = mBindery.Init();
     if (NS_FAILED(rv)) return rv;