diff --git a/Source/Game/Spells/SpellManager.cs b/Source/Game/Spells/SpellManager.cs
index 7fc13c40c..bcc835e6f 100644
--- a/Source/Game/Spells/SpellManager.cs
+++ b/Source/Game/Spells/SpellManager.cs
@@ -2207,6 +2207,18 @@ namespace Game.Entities
 
                 if (effect.Effect == (int)SpellEffectName.Language)
                     Global.LanguageMgr.LoadSpellEffectLanguage(effect);
+
+                switch ((AuraType)effect.EffectAura)
+                {
+                    case AuraType.AddFlatModifier:
+                    case AuraType.AddPctModifier:
+                    case AuraType.AddPctModifierBySpellLabel:
+                    case AuraType.AddFlatModifierBySpellLabel:
+                        Cypher.Assert(effect.EffectMiscValue[0] < (int)SpellModOp.Max, $"MAX_SPELLMOD must be at least {effect.EffectMiscValue[0] + 1}");
+                        break;
+                    default:
+                        break;
+                }
             }
 
             foreach (SpellAuraOptionsRecord auraOptions in CliDB.SpellAuraOptionsStorage.Values)