Timer stops app

I´m using B4A Version 5.80 registered version and try to get a timer running.

Timer initialization works fine. Period set is to 5000 ms. But for 1000 or 100 it´s the same.

Running the app displays first message box and after clicking Ok it takes 5 seconds until app ends without displaying specific error information.
Running the app and not clicking OK at first message box does not end the app until OK is pressed and then app is stopped after one more second. Using FirstTime flag statement...

Timer stops app

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