From 960d97de4903de279e02bd2def60850db8a30b8c Mon Sep 17 00:00:00 2001
From: Electroblob77 <35599699+Electroblob77@users.noreply.github.com>
Date: Mon, 2 Sep 2019 16:03:40 +0100
Subject: [PATCH] Prevent IndexOutOfBoundsException when clicking an
 already-remembered stone circle, fixes second crash in #217

---
 .../electroblob/wizardry/block/BlockTransportationStone.java  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/main/java/electroblob/wizardry/block/BlockTransportationStone.java b/src/main/java/electroblob/wizardry/block/BlockTransportationStone.java
index ea0595a1..979fa0f4 100644
--- a/src/main/java/electroblob/wizardry/block/BlockTransportationStone.java
+++ b/src/main/java/electroblob/wizardry/block/BlockTransportationStone.java
@@ -73,7 +73,7 @@ public class BlockTransportationStone extends Block {
 	public boolean isOpaqueCube(IBlockState state){
 		return false;
 	}
-	
+
 	@Override
 	public boolean isSideSolid(IBlockState base_state, IBlockAccess world, BlockPos pos, EnumFacing side){
 		return side == EnumFacing.DOWN;
@@ -147,7 +147,7 @@ public class BlockTransportationStone extends Block {
 								if(locations.isEmpty()) locations.add(here);
 								else{
 									locations.remove(here); // Prevents duplicates
-									locations.set(locations.size() - 1, here);
+									locations.set(Math.max(locations.size() - 1, 0), here);
 								}
 								if(!world.isRemote) player.sendStatusMessage(new TextComponentTranslation("tile." + Wizardry.MODID + ":transportation_stone.confirm", Spells.transportation.getNameForTranslationFormatted()), true);
 							}