--- a/netwerk/protocol/http/AltDataOutputStreamParent.cpp
+++ b/netwerk/protocol/http/AltDataOutputStreamParent.cpp
@@ -11,61 +11,67 @@
 namespace mozilla {
 namespace net {
 
 NS_IMPL_ISUPPORTS0(AltDataOutputStreamParent)
 
 AltDataOutputStreamParent::AltDataOutputStreamParent(nsIOutputStream* aStream)
   : mOutputStream(aStream)
   , mStatus(NS_OK)
+  , mIPCOpen(true)
 {
   MOZ_ASSERT(NS_IsMainThread(), "Main thread only");
 }
 
 AltDataOutputStreamParent::~AltDataOutputStreamParent()
 {
   MOZ_ASSERT(NS_IsMainThread(), "Main thread only");
 }
 
 mozilla::ipc::IPCResult
 AltDataOutputStreamParent::RecvWriteData(const nsCString& data)
 {
   if (NS_FAILED(mStatus)) {
-    Unused << SendError(mStatus);
+    if (mIPCOpen) {
+      Unused << SendError(mStatus);
+    }
     return IPC_OK();
   }
   nsresult rv;
   uint32_t n;
   if (mOutputStream) {
     rv = mOutputStream->Write(data.BeginReading(), data.Length(), &n);
     MOZ_ASSERT(n == data.Length());
-    if (NS_FAILED(rv)) {
+    if (NS_FAILED(rv) && mIPCOpen) {
       Unused << SendError(rv);
     }
   }
   return IPC_OK();
 }
 
 mozilla::ipc::IPCResult
 AltDataOutputStreamParent::RecvClose()
 {
   if (NS_FAILED(mStatus)) {
-    Unused << SendError(mStatus);
+    if (mIPCOpen) {
+      Unused << SendError(mStatus);
+    }
     return IPC_OK();
   }
   nsresult rv;
   if (mOutputStream) {
     rv = mOutputStream->Close();
-    if (NS_FAILED(rv)) {
+    if (NS_FAILED(rv) && mIPCOpen) {
       Unused << SendError(rv);
     }
     mOutputStream = nullptr;
   }
   return IPC_OK();
 }
 
 void
 AltDataOutputStreamParent::ActorDestroy(ActorDestroyReason aWhy)
 {
+  mIPCOpen = false;
 }
 
 } // namespace net
 } // namespace mozilla

--- a/netwerk/protocol/http/AltDataOutputStreamParent.h
+++ b/netwerk/protocol/http/AltDataOutputStreamParent.h
@@ -39,14 +39,15 @@ public:
   void SetError(nsresult status) { mStatus = status; }
 
 private:
   virtual ~AltDataOutputStreamParent();
   nsCOMPtr<nsIOutputStream> mOutputStream;
   // In case any error occurs mStatus will be != NS_OK, and this status code will
   // be sent to the content process asynchronously.
   nsresult mStatus;
+  bool     mIPCOpen;
 };
 
 } // namespace net
 } // namespace mozilla
 
 #endif // mozilla_net_AltDataOutputStreamParent_h