Better not check too strict
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@ -107,7 +107,7 @@ class Item extends BaseObject
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*/
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private static function indexToActivity($index)
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{
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if (!is_int($index) || !array_key_exists($index, self::ACTIVITIES)) {
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if (is_null($index) || !array_key_exists($index, self::ACTIVITIES)) {
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return '';
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}
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