When ChampionShield crown is droped on ground, gazillion errrors start to pop in Debug Log.

I tested with only your mod and requirement active, so it is not a mod conflict issue.

This is what Debug Log shows:

Exception ticking ChampionShield9284 (at (62, 0, 70)): System.NullReferenceException: Object reference not set to an instance of an object
at ExShieldBelt.ExSB_Apparel_Shield.Tick () [0x0000e] in <c510357b636943d488d9404afccdcf5f>:0
at Verse.TickList.Tick () [0x0015c] in <95de19971c5d40878d8742747904cdcd>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.TickList:Tick ()
Verse.TickManager:DoSingleTick ()
Verse.TickManager:TickManagerUpdate ()
Verse.Game:UpdatePlay ()
Verse.Root_Play:Update ()