ZP-951 Do not compare for type, as key(false) returns 0 (integer).

Released under the Affero GNU General Public License (AGPL) version 3.

src/lib/core/synccollections.php

@@ -884,7 +884,7 @@ class SyncCollections implements Iterator {
      * @return boolean
      */
     public function valid() {
-        return (key($this->collections) !== null && key($this->collections) !== false);
+        return (key($this->collections) != null && key($this->collections) != false);
     }
 
     /**