i was racing with full AIs on the BL1_Jumps track(see Autocross layouts) when most of the AIs were hitting each other, the error occured

Did you hit lots of movable objects? (sorry going to sleep have no time for replay :o)

If you hit tons of objects like tires, cars and other stuff, you will get this error. It goes away once everything settles, but... nothing to prevent it, I think it is there for a reason, so your system doesn't try and calculate the excess phsyics movements.... could slow your system down probably