When simultaneous log in for the same user are active at the same time, then in such scenerio debugger will get open in any of the other session with same user id.
Put the breakpoint on very first executable statement of your event handler also check if you have open any other seesion or someone has logged in the system with your user id .
log off from the system . Now log in again . If any other session would have open , you will get a pop up .
choose the option to terminate all other session .
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