Grouping issues by key/value custom field raises error 500
When trying to group issues in issues list by key/value custom field en error occured
An error occurred while executing the query and has been logged. Please report this error to your Redmine administrator.
Tested on a fresh redmine installation without plugins.
Environment: Redmine version 3.2.0.stable Ruby version 2.1.8-p440 (2015-12-16) [x86_64-linux] Rails version 4.2.5 Environment production Database adapter Mysql2 SCM: Subversion 1.8.13 Git 2.6.1 Filesystem Redmine plugins: no plugin installed