System.ArgumentNullException at UpdateCommand

[koppor]

When starting OneNote, I get

14|07:07:02.269| Error running command UpdateCommand
14|07:07:02.270| System.ArgumentNullException
Message: Value cannot be null.
Parameter name: input
Source: System
StackTrace:    at System.Text.RegularExpressions.Regex.Match(String input)
   at System.Text.RegularExpressions.Regex.Match(String input, String pattern)
   at River.OneMoreAddIn.Commands.Tools.Updater.Updater.<FetchLatestRelease>d__29.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at River.OneMoreAddIn.Commands.UpdateCommand.<Execute>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at River.OneMoreAddIn.CommandFactory.<Run>d__6.MoveNext()
TargetSite: [System] System.Text.RegularExpressions.Regex::Match()

I installed the update to 6.5.1 before.