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Fix: when _listeners object is undefined it would trigger a TypeError. #4232

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Fix: when _listeners object is undefined it would trigger a TypeError. #4232

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2 changes: 1 addition & 1 deletion backbone.js
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Original file line number Diff line number Diff line change
Expand Up @@ -374,7 +374,7 @@
// Cleans up memory bindings between the listener and the listenee.
Listening.prototype.cleanup = function() {
delete this.listener._listeningTo[this.obj._listenId];
if (!this.interop) delete this.obj._listeners[this.id];
if (!this.interop && typeof this.obj._listeners !== 'undefined' ) delete this.obj._listeners[this.id];
};

// Aliases for backwards compatibility.
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