Plugin makes Distribution APK to Crash

Hi guys! I have a problem with a plugin for android.

When I launch the game from the editor to my android device or just install a not for distribution apk it works perfect but if I build for distribution with the plugin enabled the game crashes when opening.

A friend made this plugin for me and he can modify what is needed. We just need some clue.
What can make an apk to fail because a plugin only if its distribution version?