diff --git a/mozilla/netwerk/dns/src/nsDnsService.cpp b/mozilla/netwerk/dns/src/nsDnsService.cpp
index 1a0bb6cd796..89a20efc290 100644
--- a/mozilla/netwerk/dns/src/nsDnsService.cpp
+++ b/mozilla/netwerk/dns/src/nsDnsService.cpp
@@ -1202,6 +1202,9 @@ nsDNSService::Shutdown()
     if (mThread == nsnull) return rv;
 #endif
 
+    if (!mMonitor) // already shutdown or not init'ed as yet. 
+        return rv; 
+
     {
         nsAutoMonitor mon(mMonitor);        // protect mLookups
 
@@ -1236,6 +1239,12 @@ nsDNSService::Shutdown()
     // Have to break the cycle here, otherwise nsDNSService holds onto the thread
     // and the thread holds onto the nsDNSService via its mRunnable
     mThread = nsnull;
+
+	if (mMonitor) 
+	{
+        nsAutoMonitor::DestroyMonitor(mMonitor);
+		mMonitor = nsnull;
+    }
     
     return rv;
 }