crashes site at activation

maybe you can try to turn-on wp_debug or check your php logs to see if there’s any other error which can give us more hints to the issue. also, to narrow down the problem have you tried to temporarily:

– deactivating all other plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).
– switching to the default theme to rule out any theme-specific problems