Not Shutting Down Async Tasks on Shutdown

[Hye-Dev]

Whenever I shutdown my server it throws an error in the log saying the following:
[15:06:39 ERROR]: Nag author: 'alex9849' of 'AdvancedRegionMarket' about the following: This plugin is not properly shutting down its async tasks when it is being shut down. This task may throw errors during the final shutdown logs and might not complete before process dies.