Conflict between "volunteer_timeslots 5.x-1.0" and "gallery2"

There's a conflict between "volunteer_timeslots 5.x-1.0" and "gallery-5.x-1.0" module. Whenever "volunteer_timeslots 5.x-1.0" is enabled as a module the "gallery" link on the left menu fails to work and defaults to a Gallery2 blank page. Disabling the "volunteer_timeslots 5.x-1.0" module fixes the problem and the link works again properly.