ArrayIndexOutOfBoundsException: 0. In Location.getWorldByEncodedAltitude

[xuetaolu]

While using mc.entity.spawnEntity("falling_block", ... ) frequently, like spawn 5 to 10 times per game tick, that is 40 to 200 times per second. It may occur java.lang.ArrayIndexOutOfBoundsException: 0.

[11:08:36] [Thread-24/INFO] [STDOUT]: [mobi.omegacentauri.raspberryjammod.APIHandler:spawnEntity:923]: Helo
[11:08:36] [Thread-24/INFO] [STDOUT]: [mobi.omegacentauri.raspberryjammod.APIHandler:spawnEntity:925]: ren
[11:08:36] [Thread-24/INFO] [STDOUT]: [mobi.omegacentauri.raspberryjammod.APIHandler:rename111:909]: Searching for FallingSand
[11:08:36] [Thread-24/INFO] [STDOUT]: [mobi.omegacentauri.raspberryjammod.APIHandler:rename111:913]: found minecraft:falling_block
[11:08:36] [Thread-24/INFO] [STDOUT]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:515]: java.lang.ArrayIndexOutOfBoundsException: 0
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: java.lang.ArrayIndexOutOfBoundsException: 0
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: at mobi.omegacentauri.raspberryjammod.Location.getWorldByEncodedAltitude(Location.java:26)
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: at mobi.omegacentauri.raspberryjammod.Location.decodeVec3w(Location.java:72)
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: at mobi.omegacentauri.raspberryjammod.APIHandler.spawnEntity(APIHandler.java:932)
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: at mobi.omegacentauri.raspberryjammod.APIHandler.runCommand(APIHandler.java:779)
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: at mobi.omegacentauri.raspberryjammod.APIHandler.process(APIHandler.java:504)
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: at mobi.omegacentauri.raspberryjammod.APIServer.socketCommunicate(APIServer.java:146)
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: at mobi.omegacentauri.raspberryjammod.APIServer.access$000(APIServer.java:41)
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: at mobi.omegacentauri.raspberryjammod.APIServer$1.run(APIServer.java:113)
[11:08:36] [Thread-24/INFO] [STDERR]: [mobi.omegacentauri.raspberryjammod.APIHandler:process:516]: at java.lang.Thread.run(Unknown Source)
[11:08:36] [Server thread/INFO] [FML]: Applying holder lookups
[11:08:36] [Server thread/INFO] [FML]: Holder lookups applied
[11:08:36] [Server thread/INFO] [FML]: The state engine was in incorrect state SERVER_STOPPING and forced into state SERVER_STOPPED. Errors may have been discarded.
[11:08:36] [main/INFO] [FML]: Server terminated.
[11:08:36] [Client Shutdown Thread/INFO] [net.minecraft.server.MinecraftServer]: Stopping server
[11:08:36] [Client Shutdown Thread/INFO] [net.minecraft.server.MinecraftServer]: Saving players

Maybe, if the game lag due to using spawnEntity command frequently, the length of var serverWorlds will be 0, in Location.getWorldByEncodedAltitude.