Plugin BetterNotifications does not working properly on Vanilla 2.5.1 [RESOLVED]

I have updated to Vanilla 2.5.1 and plugin does not working properly.
Users complain to receive to much emails.
Some one have similar problem?
Any suggestion? How could the problem be detected?
Thanks in advance
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Comments
Please take a look at the pull request that I've just made. Changing that little bit of code (and deleting /cache/addon.php afterwards) should fix the problem
Thanks a lot @R_J for quick solution. I will try it and write here.
The plugin works correctly now. Thanks.
@R_J thanks for that! I will roll it in and release an update presently
v2.0.4 has now been released