Due to a engine bug, there was a bug in particle collisions making the game crash in some conditions, it was especially visible when exploding zombies.
We've updated the game to a more recent version of Unity that should fix this issue.
Unfortunately, the latest version of Unity with this fix is not compatible with 32 bits versions Linux. So, if you are still using one of those, you'll have to keep using the Legacy version version of the game.
Let us know if the crash is still happening on this bug thread.
Thanks for your support and sorry for the inconvenience.
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Other announcements
Patch 1.5.3Fixed regression with crawlers due to tank fixPatch 1.5.2New Languages : Traditional Chinese · Fixed issues with Tanks something getting stuck on slopes · Tweaked Blood Harvest to avoid the Harvester being duplicated · Fixed some achievement issuesPatch 1.5.1Here is a small patch to fix some of reported issues. · Fixed spit projectiles slowed down by stairs and passing through walls in some cases · Fixed corpses & characters sometimes staying attached to elevators · Fixed DNA preview Text not being shown · Fixed some translations · Tweaked some levels