fixes #9734

javascript/src/QfqForm.js

@@ -152,7 +152,8 @@ var QfqNS = QfqNS || {};
         this.form.on('form.validation.failed', this.validationError);
         this.form.on('form.validation.success', this.validationSuccess);
 
-        window.onbeforeunload = function (e) {
+        // Solves problem of leaving the page without releasing locks.
+        window.onbeforeunload = function (e) { 
             that.releaseLock();
         };