help with a mistake

[hazael]

this is the error and an impressive amount of this appears, I don't know what generates it please help me

Root level exception in Update(): System.NullReferenceException: Object reference not set to an instance of an object
  at RimWorld.MusicManagerPlay.StartNewSong () [0x0000c] in <a614afa193f349e2bef17a9751230ace>:0
  at RimWorld.MusicManagerPlay.MusicUpdate () [0x003d8] in <a614afa193f349e2bef17a9751230ace>:0
  at Verse.Root_Play.Update () [0x00037] in <a614afa193f349e2bef17a9751230ace>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch1 (string)
Verse.Root_Play:Update ()