Exception causes conflict w/ other plugins

[Rhundas]

System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. (Not on main thread!)
 ---> System.InvalidOperationException: Not on main thread!
   at Dalamud.Game.ClientState.ClientState.get_LocalPlayer() in /_/Dalamud/Game/ClientState/ClientState.cs:line 120
   at PrefPro.PrefPro.get_PlayerName() in /work/repo/PrefPro/PrefPro.cs:line 43
   at PrefPro.Configuration.GetOrDefault() in /work/repo/PrefPro/Configuration.cs:line 152
   at PrefPro.PrefPro.GetStringDetour(RaptureTextModule* raptureTextModule, Byte* text, Void* unknown2, Utf8String* output) in /work/repo/PrefPro/PrefPro.cs:line 129
   at AutoVisor.Managers.CommandManager.Execute(String message)
   at AutoVisor.Managers.CPoseManager.<>c__DisplayClass28_0.<SetPose>b__0()
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
   --- End of inner exception stack trace ---

Funny exception thrown by PrefPro when attempting to use AutoVisor's /ppose functionality. Disabling PrefPro 'solves' the issue and suggests PrefPro being the root of the problem.