Try updating your video card driver.
Verify your game files. Right click on Steam> Library> Ets2> Properties> Local files> Verify the integrity of the game cache.
If you've played with the Config file, restore it, if possible, or get a new one. My Documents / Euro Truck Simulator 2 / config.cfg
You may be related to your profile file, open a new one.
If you get this error in crowded areas, it is related to the update or your computer.
You may have a problem caused by a lack of files, delete the game and install it again.
Check if you have received the error in Singleplayer.