From cc3a291c833f94aea3fddad9469e9aef86d4bf61 Mon Sep 17 00:00:00 2001
From: Owain van Brakel <owain.vanbrakel@gmail.com>
Date: Sun, 10 Nov 2019 06:05:28 +0100
Subject: [PATCH] spellbook: StringIndexOutOfBoundsException and
 ArithmeticException

---
 .../client/plugins/spellbook/SpellbookPlugin.java     | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/spellbook/SpellbookPlugin.java b/runelite-client/src/main/java/net/runelite/client/plugins/spellbook/SpellbookPlugin.java
index fc89a74dc9..3e00c6342a 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/spellbook/SpellbookPlugin.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/spellbook/SpellbookPlugin.java
@@ -387,6 +387,12 @@ private void onScriptCallbackEvent(final ScriptCallbackEvent event)
 				break;
 			case "resizeSpell":
 				final int size = this.size;
+
+				if (size == 0)
+				{
+					return;
+				}
+
 				final int columns = clamp(FULL_WIDTH / size, 2, 3);
 
 				iStack[iStackSize - 2] = size;
@@ -727,6 +733,11 @@ private static boolean isUnfiltered(final String spell, final Set<String> unfilt
 		{
 			boolean b;
 
+			if (str.length() == 0)
+			{
+				continue;
+			}
+
 			if (str.charAt(0) == '\"')
 			{
 				if (str.charAt(str.length() - 1) == '\"')