Environment

JabRef version v5.0 on macOS 10.15.4
Same issue is reproducible on the development snapshot from https://builds.jabref.org/master/ (v5.1).

• I have tested the latest development version from http://builds.jabref.org/master/ and the problem persists

Steps to reproduce the behavior:

1. Download the .dmg or .pkg package from either:

• https://www.fosshub.com/JabRef.html or
• https://github.com/JabRef/jabref/releases/tag/v5.0

2. Attempt to install it.
3. Observe the error: