The latest patch 1.14.0-f8 introduces a bug, when selecting Random Vehicles in any Service Building. This is a game bug and require a fix from CO. Issue is not caused by a mod.

The bug also defaults a vanilla vehicle, e.g. the vanilla police car. AVO cannot prevent this spawning.

Workaround: Use Service Vehicle Selector (SVS2) by Bloddy Penguin. This disables the CO functionality and replaces the selection options.

Error message identified:

System.NullReferenceException: Object reference not set to an instance of an object
at PlayerBuildingAI+<ReplaceVehicles>c__AnonStorey0.<>m__0 () [0x00000] in <filename unknown>:0
at AsyncAction.Execute () [0x00000] in <filename unknown>:0