From ad5e9449d2ec885ce547ed44ac3be066de803784 Mon Sep 17 00:00:00 2001
From: Moonchild <moonchild@palemoon.org>
Date: Sat, 25 Jul 2020 17:31:58 +0000
Subject: Issue #1587 Part 12 (followup 2): Allow clearing of signal by setting
 to null.

---
 dom/fetch/FetchDriver.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'dom/fetch/FetchDriver.cpp')

diff --git a/dom/fetch/FetchDriver.cpp b/dom/fetch/FetchDriver.cpp
index 067e32db4..fd1e99a2b 100644
--- a/dom/fetch/FetchDriver.cpp
+++ b/dom/fetch/FetchDriver.cpp
@@ -499,6 +499,11 @@ FetchDriver::OnStartRequest(nsIRequest* aRequest,
     return rv;
   }
 
+  if (!mChannel) {
+    MOZ_ASSERT(!mObserver);
+    return NS_BINDING_ABORTED;
+  }
+
   // We should only get to the following code once.
   MOZ_ASSERT(!mPipeOutputStream);
   MOZ_ASSERT(mObserver);
-- 
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