Players riding a vehicle crash server when hitting border.

[drheat]

Players in a boat crash the server when hitting the border and being remounted, on this line: https://github.com/abused/World-Border/blob/master/src/main/java/com/wimbli/WorldBorder/BorderCheck.java#L65

This is on a dedicated forge-1.12.2-14.23.5.2836 server, using version World-Border-1.12.2-1.0.5

Relevant log fragment from the debug log:

[02:50:38] [Server thread/TRACE] [worldborder]: Border crossing @ world 'world'. Border: radius 10000 at X: 20.5 Z: 248.5
[02:50:38] [Server thread/TRACE] [worldborder]: Player @ X: 851.75 Y: 62.07 Z: -9717.47
[02:50:38] [Server thread/TRACE] [worldborder]: New position @ X: 851.50 Y: 62.00 Z: -9713.50
[02:50:38] [Server thread/TRACE] [worldborder]: Player was riding a "EntityBoat['Boat'/349, l='world', x=851.75, y=62.52, z=-9717.47]".
[02:50:38] [Server thread/ERROR] [FML]: Exception caught during firing event net.minecraftforge.fml.common.gameevent.TickEvent$ServerTickEvent@3829bbe9:
java.lang.IllegalAccessError: tried to access field net.minecraft.entity.Entity.field_184244_h from class com.wimbli.WorldBorder.BorderCheck
        at com.wimbli.WorldBorder.BorderCheck.checkPlayer(BorderCheck.java:65) ~[BorderCheck.class:?]
        at com.wimbli.WorldBorder.task.BorderCheckTask.onServerTick(BorderCheckTask.java:48) ~[BorderCheckTask.class:?]