Bug 810743 - First check for pending exceptions, _then_ examine the invoke result. r=mrbkap

js/xpconnect/src/XPCWrappedNative.cpp

@@ -2474,12 +2474,12 @@ CallMethodHelper::Call()
 
     mCallContext.GetXPCContext()->SetLastResult(invokeResult);
 
-    if (NS_FAILED(invokeResult)) {
-        ThrowBadResult(invokeResult, mCallContext);
+    if (JS_IsExceptionPending(mCallContext)) {
         return false;
     }
 
-    if (JS_IsExceptionPending(mCallContext)) {
+    if (NS_FAILED(invokeResult)) {
+        ThrowBadResult(invokeResult, mCallContext);
         return false;
     }