Don't use isset
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		|  | @ -107,7 +107,7 @@ class Item extends BaseObject | |||
| 	 */ | ||||
| 	private static function indexToActivity($index) | ||||
| 	{ | ||||
| 		if (!isset(self::ACTIVITIES[$index])) { | ||||
| 		if (!is_int($index) || !array_key_exists($index, self::ACTIVITIES)) { | ||||
| 			return ''; | ||||
| 		} | ||||
| 
 | ||||
|  |  | |||
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