Error when calling OnPlayerDeath

Sometimes I'm getting this error, not sure if its causing anything in-game or not.

Failed to call internal hook 'OnPlayerDeath' on plugin 'MonumentLock v1.8.6' [3560982762] (Collection was modified; enumeration operation may not execute.)
   at bool System.Collections.Generic.List+Enumerator.MoveNextRare()
   at bool System.Collections.Generic.List+Enumerator.MoveNext()
   at object Oxide.Plugins.MonumentLock.OnPlayerDeath(BasePlayer player, HitInfo info) in D:/TCAFiles/Users/xxxxx/3xxxxx4/carbon/plugins/MonumentLock.cs:line 118
   at object Oxide.Plugins.MonumentLock.InternalCallHook(uint hook, object[] args) in MonumentLock.cs/Internal:line 470

Changed Status from Pending to Closed

Changed Fixed In to 1.9.2