When a player hits an enemy during a raid and attempts to teleport away, the server crashes. This only occurs if another player on the server is within the same area as the raid. If there is only one player in the vicinity, the crash does not occur. Crash occurs after a teleport or a player death (assuming there is another player in the area of the raid at that time). Server is vanilla 1.14.3 and bug is consistently repeatable under these circumstances. Issue is not repeatable in a singleplayer world.