Gantt report in project module

Bug in gantt report:

ERROR: operator does not exist: character varying = integer
LINE 1: ...our_from,hour_to from hr_timesheet where dayofweek=5 and tgr...
                                                             ^
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts.

select hour_from,hour_to from hr_timesheet where dayofweek=5 and tgroup_id=1 order by hour_from

I have solved it by changing SQL clause in hr.py, see attached file.