KLCK asking for identity confirmation

Sometimes, when i wake my device, KLCK asks me for "confirm your identity" like when i do a purchase in Google Play.

No matter if i confirm with fingerprint or press on cancel, it keeps working but after a while it's asks me the same.

I have all kustom apps bought but KLCK is the only with this issue.

SOLVED: if anyone will encounter this: it seems that disabling fingerprint solved the problem