Sorry, but your description is so vague that the only thing I can say is: “It seems the difference is that your code is doing it wrong”. Not helpful, I know:-)

Can you maybe provide some of your code? A buildable example would be best.

ok but i copy my code from testcon example,i will wrote it here but you can’t run it because it communicate with a fingerprint device you don’t have it,
the problem is on testcon it get me a correct integer input
but in my program it is crashed