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-rw-r--r--dom/ipc/ProcessHangMonitor.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/dom/ipc/ProcessHangMonitor.cpp b/dom/ipc/ProcessHangMonitor.cpp
index d46a1f5d5..406d0bf0a 100644
--- a/dom/ipc/ProcessHangMonitor.cpp
+++ b/dom/ipc/ProcessHangMonitor.cpp
@@ -323,6 +323,8 @@ HangMonitorChild::Shutdown()
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
+ BackgroundHangMonitor::UnregisterAnnotator(*this);
+
MonitorAutoLock lock(mMonitor);
while (!mShutdownDone) {
mMonitor.Wait();