diff --git a/zone/spell_effects.cpp b/zone/spell_effects.cpp
index 33090b07f..3ec303d3f 100644
--- a/zone/spell_effects.cpp
+++ b/zone/spell_effects.cpp
@@ -4690,6 +4690,8 @@ void Mob::BuffFadeBySlot(int slot, bool iRecalcBonuses, bool suppress, uint32 su
 			client->ReapplyBuff(slot, true);
 		} else {
 			// Reapply visual/state effects for non-client mobs (pets, NPCs, bots)
+			if (!IsValidSpell(buffs[slot].spellid))
+				return false;
 			const auto& spell = spells[buffs[slot].spellid];
 			for (int i = 0; i < EFFECT_COUNT; i++) {
 				switch (spell.effect_id[i]) {