As soon as the player joins the server it crashes, this only happened after he moved to a certain area outside his base. 

The Server throws out these errors:
[02/20/2019 10:53:53 pm] [Server thread/ERROR]: This crash report has been saved to: /home/container/./crash-reports/crash-2019-02-21_03.53.13-server.txt
[02/20/2019 10:53:53 pm] [Server thread/INFO]: Stopping server
[02/20/2019 10:53:53 pm] [Server thread/INFO]: Saving players
[02/20/2019 10:53:53 pm] [Server thread/INFO]: ZoobDood lost connection: Internal Exception: java.lang.StackOverflowError
[02/20/2019 10:53:53 pm] [Server thread/INFO]: ZoobDood left the game
[02/20/2019 10:53:53 pm] [Server thread/ERROR]: Exception stopping the server
[02/20/2019 10:53:53 pm]: java.lang.IllegalStateException: Removing entity while ticking!
[02/20/2019 10:53:53 pm]: at uv.h(SourceFile:941) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at uv.e(SourceFile:958) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at xf.c(SourceFile:335) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at vn.a(SourceFile:1002) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at iw.l(SourceFile:401) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at afs.d(SourceFile:37) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at vn.b(SourceFile:275) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at xf.s(SourceFile:753) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at net.minecraft.server.MinecraftServer.l(SourceFile:554) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at tw.l(SourceFile:587) ~[snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at net.minecraft.server.MinecraftServer.run(SourceFile:667) [snapshot-19w08a.jar:?]
[02/20/2019 10:53:53 pm]: at java.lang.Thread.run([Thread.java:748|http://thread.java:748/]) [?:1.8.0_181]

I've attached the Error Log as well.