No idea why and I can't recall what I did to trigger it. Here's the log:
NullReferenceException
at (wrapper managed-to-native) UnityEngine.AudioSource.set_dopplerLevel(UnityEngine.AudioSource,single)
at Turbojet.Animate () [0x0006d] in <5cc5f411fe4b4ab99f47857a2cf9acca>:0
at Turbojet.FixedUpdate () [0x00001] in <5cc5f411fe4b4ab99f47857a2cf9acca>:0
This message repeated like 20 times. Nothing happened, maybe a bit of slowdown but no big issues.
I have the full log but I don't think the whole rest is really useful