Drone build stuck running even though it's not running

The drone build says it’s still running, but the server thinks it’s not. This is very annoying. Also, new builds are stuck waiting. I’ve reloaded the page and cleared my cache and I get the same results. The only way to fix it is to restart the server. If I try to force stop the build, it says that it can’t stop a non-running build.

I’m using drone/drone:0.8.4

The following is the error message that I get when I try and stop the build.