Console error Failed to call internal hook 'OnUserPermissionRevoked'

I'm getting this from time to time. I don't know specifically what is triggering it:

Failed to call internal hook 'OnUserPermissionRevoked' on plugin 'DiscordLogger v2.0.20' [1879829838] (Invalid URI: The format of the URI could not be determined.)
at void Uri.CreateThis(string uri, bool dontEscape, UriKind uriKind)
at new Uri(string uriString)
at new Oxide.Core.Libraries.WebRequests+WebRequest(string url, Action<int, string> callback, Plugin owner) in /__w/Carbon/Carbon/Carbon.Core/Carbon.Components/Carbon.Common/src/Oxide/Libraries/WebRequest.cs:line 160
at WebRequest Oxide.Core.Libraries.WebRequests.Enqueue(string url, string body, Action<int, string> callback, Plugin owner, RequestMethod method, Dictionary<string, string> headers, float timeout, DecompressionMethods decompressionMethod) in /__w/Carbon/Carbon/Carbon.Core/Carbon.Components/Carbon.Common/src/Oxide/Libraries/WebRequest.cs:line 29
at void Oxide.Plugins.DiscordLogger.DiscordSendMessage(string url, DiscordMessage message) in /home/container/carbon/plugins/DiscordLogger.cs:line 2040
at void Oxide.Plugins.DiscordLogger.HandleQueue() in /home/container/carbon/plugins/DiscordLogger.cs:line 1275
at void Oxide.Plugins.DiscordLogger.DiscordSendMessage(string message, string webhookUrl, bool stripTags) in /home/container/carbon/plugins/DiscordLogger.cs:line 1681
at void Oxide.Plugins.DiscordLogger.OnUserPermissionRevoked(string playerID, string permName) in /home/container/carbon/plugins/DiscordLogger.cs:line 1195
at object Oxide.Plugins.DiscordLogger.InternalCallHook(uint hook, object[] args) in DiscordLogger.cs/Internal:line 661

Still getting it... 

Failed to call internal hook 'OnEntitySpawned' on plugin 'DiscordLogger v2.0.20' [2949838417] (Invalid URI: The format of the URI could not be determined.)
   at void Uri.CreateThis(string uri, bool dontEscape, UriKind uriKind)
   at new Uri(string uriString)
   at new Oxide.Core.Libraries.WebRequests+WebRequest(string url, Action<int, string> callback, Plugin owner) in /home/runner/work/Carbon/Carbon/Carbon.Core/Carbon.Components/Carbon.Common/src/Oxide/Libraries/WebRequest.cs:line 160
   at WebRequest Oxide.Core.Libraries.WebRequests.Enqueue(string url, string body, Action<int, string> callback, Plugin owner, RequestMethod method, Dictionary<string, string> headers, float timeout, DecompressionMethods decompressionMethod) in /home/runner/work/Carbon/Carbon/Carbon.Core/Carbon.Components/Carbon.Common/src/Oxide/Libraries/WebRequest.cs:line 29
   at void Oxide.Plugins.DiscordLogger.DiscordSendMessage(string url, DiscordMessage message) in /home/container/carbon/plugins/DiscordLogger.cs:line 2040
   at void Oxide.Plugins.DiscordLogger.HandleQueue() in /home/container/carbon/plugins/DiscordLogger.cs:line 1275
   at void Oxide.Plugins.DiscordLogger.DiscordSendMessage(string message, string webhookUrl, bool stripTags) in /home/container/carbon/plugins/DiscordLogger.cs:line 1681
   at void Oxide.Plugins.DiscordLogger.HandleEntity(BaseEntity baseEntity) in /home/container/carbon/plugins/DiscordLogger.cs:line 1419
   at void Oxide.Plugins.DiscordLogger.OnEntitySpawned(BradleyAPC entity) in /home/container/carbon/plugins/DiscordLogger.cs:line 641
   at object Oxide.Plugins.DiscordLogger.InternalCallHook(uint hook, object[] args) in DiscordLogger.cs/Internal:line 209​