Unity Ad 2.0.4 Crashes Playing Audio after Rewarded

Hi, i am having an issue where i am playing a resurrection audio after the player uses rewarded AD, the function works fine if i call it out of ad callback, but if i call it after the ad completes , i am not able to play the audio and the game freezes on that line.

This works well in editor, but fails in android after debugging i found out the error only happens after i watch ad on android device.

Unity Ad 2.0.4 Crashes Playing Audio after Rewarded