On IRC, a 6.2.0 user reported getting an NPE from SnapShooter.deleteOldBackups L244, with the only other frame of the stacktrace being lambda$createSnapAsync$1 L196 (it was a screenshot, not text easily cut/paste here)
The problematic L244 is...
..and i believe the root of the issue is that while getTimestamp() is declared to return an Optional<Date>, there is no guarantee that the Optional instance is itself non-null...
Allthough i'm not 100% certain, I believe the way the user was triggering this bug was by configuring classic replication configured with something like <str name="replicateAfter">commit</str> – so that usage may be neccessary to trigger the exception?
Alternatively: perhaps this exception gets logged the first time anyone tries to use any code that involves SnapShooter – and after that a timestamp file is created and teh problem neer manifests itself again?