clone for autocomplete fields broken

WP4.2.2 with RWMB 4.5.2 broke cloning of field type=”‘autocomplete’. when trying to clone a autocomplete field no option-values are shown and the cloned field is not saved.

Console shows this Error:

clone.js?ver=4.5.2:35 Uncaught TypeError: Cannot read property ‘replace’ of undefined(anonymous function) @ clone.js?ver=4.5.2:35m.extend.each @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,backbone,jquery-ui-core,jquery-ui…:2m.fn.m.each @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,backbone,jquery-ui-core,jquery-ui…:2add_cloned_fields @ clone.js?ver=4.5.2:16(anonymous function) @ clone.js?ver=4.5.2:186m.event.dispatch @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,backbone,jquery-ui-core,jquery-ui…:3m.event.add.r.handle @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,backbone,jquery-ui-core,jquery-ui…

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