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Nifi ListFTP failed to process session due to java.lang.NullPointerException; Processor Administratively Yielded for 1 sec

Nifi ListFTP failed to process session due to java.lang.NullPointerException; Processor Administratively Yielded for 1 sec

Explorer

Hello

 out ListFTP processors stop working after moving time 1 hour ahead regularly 29.3.2020 2am(CET).

We think that is due to inconsistent time on unix and file timestamp. At 2 am it came file with 3 am timestamp, After changing timestamp back, reset processor state, restart processor,  restart whole Nifi and delete files, there is still the same error message. When we create adhoc ListFTP with regexp other day, it works. 

Any idea?

Nifi 1.11.3 single node

Regards

Kamil