Merchant Expertise module throws exceptions on any move. Impossible to uninstall

[mfdenis]

PS 1.7.7.1,
module version 2.3.2
Error reads: "Exception thrown by module gamification on disable. Error when disabling module gamification. Property Tab->name is empty.."

tired of that stupid notifications, and firstly decided to disable this idiotic module, but got exception:

 

Then I tried to uninstall this buggy piece of code completely, and got another exception:

 

Any help to fix this?

Thanks in advance!