From e3945da045a33afc3cc69209e995714d58d51757 Mon Sep 17 00:00:00 2001
From: Gleb Mazovetskiy <glex.spb@gmail.com>
Date: Sat, 9 Apr 2022 00:38:11 +0100
Subject: [PATCH] Fix a negative shift exponent sanitizer warning

    Source/spells.h:54:14: runtime error: shift exponent -1 is negative
---
 Source/panels/spell_list.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Source/panels/spell_list.cpp b/Source/panels/spell_list.cpp
index 817989b4d..ae329461e 100644
--- a/Source/panels/spell_list.cpp
+++ b/Source/panels/spell_list.cpp
@@ -321,8 +321,9 @@ void ToggleSpell(int slot)
 		return;
 	}
 
-	if ((spells & GetSpellBitmask(myPlayer._pSplHotKey[slot])) != 0) {
-		myPlayer._pRSpell = myPlayer._pSplHotKey[slot];
+	const spell_id spellId = myPlayer._pSplHotKey[slot];
+	if (spellId != SPL_INVALID && spellId != SPL_NULL && (spells & GetSpellBitmask(spellId)) != 0) {
+		myPlayer._pRSpell = spellId;
 		myPlayer._pRSplType = myPlayer._pSplTHotKey[slot];
 		force_redraw = 255;
 	}