The upstream author suggests that the issue may be related to the "H2 Database 
Engine" (Debian package: jameica-h2database) in a similar, but not identical case 

Upstream H2 is at version 2.2.224, whereas Debian is at 1.4.197-7, which is 
approx. six years old.

An update of jameica-h2database will likely fix this issue?

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