Version 4.6.0 of the Minie physics library was released today (4 December).
The release includes the fix for issue #19 (zero-thickness mesh shape crashes the JRE) and some related bugs.
Effective with this release, Minie no longer supports 32-bit macOS. (The build difficulties became overwhelming.) If your apps need to run on 32-bit macs, stick with Minie v4.5 or earlier, or else switch to jme3-jbullet.
If you have projects that use Minie and don’t need to run on 32-bit macOS, I recommend updating to v4.6.0 as soon as possible.