An injury Justin Timberlake suffered while performing a stunt on the set of his new movie, Now, has shut down the production, according to E! Online.

Timberlake has been on crutches while performing promotional duties for other projects — including the Social Network and Yogi Bear — while waiting for his wounded calf muscle to heal. “(Timberlake) hasn’t heard anything about the MRI results, but they’re freezing production until he’s off crutches and able to act again,” a source says.