diff --git a/netwerk/protocol/http/nsHttpTransaction.cpp b/netwerk/protocol/http/nsHttpTransaction.cpp
index 8d837d1723..76e0a4ad9c 100644
--- a/netwerk/protocol/http/nsHttpTransaction.cpp
+++ b/netwerk/protocol/http/nsHttpTransaction.cpp
@@ -1164,7 +1164,9 @@ nsHttpTransaction::Close(nsresult reason)
     }
 
     // closing this pipe triggers the channel's OnStopRequest method.
-    mPipeOut->CloseWithStatus(reason);
+    if (mPipeOut) {
+      mPipeOut->CloseWithStatus(reason);
+    }
 
 #ifdef WIN32 // bug 1153929
     MOZ_DIAGNOSTIC_ASSERT(mPipeOut);