Switching main navigations when rest timer is counting

[senpl]

Found in version:
0.24.05
Current behavior:
App crash when rest timer is counting and user change side manu(not usual behaviour)
Expected behavior:
App should not crash
Step to reproduce:

1. to program with rest bigger then 0
2. go to Program runner
3. Activate rest timer
4. change side manu(app crash)