Fans of Frankie Muniz will have to wait to see him get behind the No. 33 truck again ... as the actor-turned-NASCAR driver busted his wrist in a freak accident -- putting him on the sideline "for the next few weeks."
Muniz shared the news on his social media Thursday, saying he fell off the top of a ladder while changing the batteries in his backyard Ring camera ... forcing him out of competition for the foreseeable future.
"While I'm gutted to miss the races, I'm grateful it wasn't worse," Muniz wrote.