Undefined error after triggering nanoflow

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Hi,    I have an app that works well, tested by many and never had issues.   Now we are running a pen test and the pen tester gets undefined errors when trying to trigger a nanoflow. It looks like some payload is not coming back to the browser correctly. It happens mainly when 1 is triggered, completed and then the next button that triggers a nanoflow fails with this error.   Any ideas on how to resolve this?
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