we have just updated users plugin to version 15.0.2 from 14.3.4.
We noticed an issue related to links with querystring containing token keyword: everytime we to access a link with with token in querystring the OneTimeLoginLinkBehavior triggers , causing a Database error related to a query created against UserTable checking for the token in querystring.
Reverting back to 14.3.4 solve the problem.
We have configured user.php setting OneTimeLogin to false without results.
This happens only when there is no identity set.