Error: The added or subtracted value results in an un-representable DateTime.

Hi guys, a custome rof mine is getting a random error, that pops up from time to time when navigating around the sales client.

i can't really see how this could have anything to do with a trigger, so i don't know what i can do to eliminate it.

The customer is Online.

Also it doesn't always pop up... That screenshot was taken after using freetext search, after hitting ok, navigating to a sale and using freetext search again, nothing happened.

So anyone knows what is up?