[Bug] "differential_drive stop" produces Segmentation fault

[slgrobotics]

Describe the bug

When running a "make px4_sitl gz_r1_rover" (or gz_lawnmower) differential_drive module runs at startup by the rc.rover_differential_apps

If user wants to stop the module, by "differential_drive stop" - a Segmentation fault happens and whole PX4 program quits.

@PerFrivik @MaEtUgR @dagar - issue created per your request

To Reproduce

pxh> differential_drive stop

... Segmentation fault

Expected behavior

The module should stop and could be started again

Screenshot / Media

No response

Flight Log

no log needed

Software Version

current main

Flight controller

N/A - sitl

Vehicle type

Rover

How are the different components wired up (including port information)

No response

Additional context

No response