Been getting this error whenever I run the library reports, recently started happening after I'd copy the tag from Artist to Album Artist
MusicBee v3.1.6590.32668 (Win10.0), 9 May 2018 17:35:
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at MusicBeePlugin.LibraryReportsPlugin.AggregatedTags.GetField(KeyValuePair`2 keyValue, Int32 fieldNumber, List`1 groupingNames)
at MusicBeePlugin.LibraryReportsPlugin.previewTrackList()
at MusicBeePlugin.PluginWindowTemplate.serializedOperation()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()