White screen on live page after activating plugin

I have a white screen on live page after activating the plugin, just a white page and no errors. Site is instantly back when I deactivate. Any idea how to solve this? I migrated data from Simple Ads Manager too. Log logs like this:

SAM Pro Edition: Free
SAM Pro Version: 2.0.0.75
SAM Pro DB Version: 1.1
Wordpress Version: 4.7.2
PHP Version: 5.3.29-1~dotdeb.0
MySQL Version: 5.1.73-1-log
PHP Max Execution Time: 300
PHP Memory Limit: 256M
WP Memory Limit: 128M