Callback not working properly if I dont have debugger in my javascript code

I have added a popup on button click on the mpp_OperationQuickEdit Form which opens form with a single relationship which I have created.It works like the 'Launch AML Editor' action on MCOs.I have added a save changes button which adds or remove relationships based on relationship added or removed.Then a callback function is provided.the relationships are added or removed successfully but the problem is that the callback works fine if I have put debugger in my javascript code otherwise it just closes both the forms the new popup and the quickEdit form.What could be the problem?

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