Bug with worker and Tow Bar mod

[Sam24815]

when ever I had this mod activated and tried hiring a worker it the worker would be hired but wouldn't move and it would give me the error message :error running lua method 'update' dataS/script/vehicle/specializations/attachable.LUA(1203) : attempt to find index field 'attach vehicle' (a nil value)

[Bruid3]

I have the same issue where the worker wont move though seems to be hired when the Towbar mod is activated.
I have tested this on Felsbrun and Oldstream Farm.