Blank Dashboard (Wordpress back-end)

After updating couple of plugins (not sure which because it was a while ago) WP Smush plugin makes Wordpress dashboard blank and wont let it load completely, when i deactivate & re-activate the plugin everything is ok, but after sometime the plugin starts causing problems again, so i have to do the same thing over and over again.
So, I have deactivated the plugin so that it wont cause these issues.

Please see into this and let me know how to fix it.

Thank you!