Crash in event handling

[lieven]

2017-11-22 09:56:19.182686+0100 TimeTracker[77812:44207312] *** -[NSMenuCustomCarbonEventHandler release]: message sent to deallocated instance 0x60000027eac0

[lieven]

Steps to reproduce:

• option-select a project or task
• while the datetime picker is open, open the status menu in the background
• confirm (or cancel?) datetime picker
  => crash