diff --git a/netwerk/cache2/CacheFileIOManager.cpp b/netwerk/cache2/CacheFileIOManager.cpp
index 20a28e930196..9f9fd511a1cf 100644
--- a/netwerk/cache2/CacheFileIOManager.cpp
+++ b/netwerk/cache2/CacheFileIOManager.cpp
@@ -1953,6 +1953,10 @@ nsresult CacheFileIOManager::Read(CacheFileHandle* aHandle, int64_t aOffset,
     return NS_ERROR_NOT_INITIALIZED;
   }
 
+  if (!aHandle) {
+    return NS_ERROR_NULL_POINTER;
+  }
+
   nsresult rv;
   RefPtr<CacheFileIOManager> ioMan = gInstance;