Check that a button mapping is defined before accessing it
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@ -14,7 +14,7 @@ function Buttons(session) {
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document.addEventListener('keydown', function(event) {
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var button = session.get('options').layout[event.key];
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if(button != undefined && mapping[button] != undefined) {
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if(button != undefined && mapping != undefined && mapping[button] != undefined) {
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event.preventDefault();
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mapping[button]();
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}
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