[Webkit-unassigned] [Bug 164762] UIScriptController: script with no async tasks fails if an earlier script registered a callback

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164762

Simon Fraser (smfr) <simon.fraser at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |simon.fraser at apple.com

--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Partial fix:

diff --git a/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp b/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp
index e2e7b0d1375c4def7e0592faf02c4d65fd9ed887..bb5c9e8becaea698f785a3e5bde20842e6549af7 100644
--- a/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp
+++ b/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp
@@ -117,6 +117,9 @@ unsigned UIScriptContext::registerCallback(JSValueRef taskCallback, CallbackType
     if (m_callbacks.contains(type))
         unregisterCallback(type);

+    if (JSValueIsUndefined(m_context.get(), taskCallback))
+        return 0;
+
     return prepareForAsyncTask(taskCallback, type);
 }

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