Assertion Error when using the Volvo FH16 sleeper cabin

[Savage.]

When customising the Volvo FH16 to have the sleeper cabin and purchasing it, the following error message will occur: 



Additionally, this issue occurs when loading into the Volvo FH16 with the sleeper cabin already added onto the truck. 

However, it does not occur when using the UK dashboard, with the steering wheel on the right side of the cabin.

[Linciano]

Bug has been fixed with the latest update.