Fix crash #3297 in Unit::HandleDummyAuraProc

src/server/game/Entities/Unit/Unit.cpp

@@ -5038,6 +5038,7 @@ bool Unit::HandleSpellCritChanceAuraProc(Unit* victim, uint32 /*damage*/, AuraEf
     return true;
 }
 
+//victim may be NULL
 bool Unit::HandleDummyAuraProc(Unit* victim, uint32 damage, AuraEffect* triggeredByAura, SpellInfo const* procSpell, uint32 procFlag, uint32 procEx, uint32 cooldown)
 {
     SpellInfo const* dummySpell = triggeredByAura->GetSpellInfo();
@@ -6229,6 +6230,9 @@ bool Unit::HandleDummyAuraProc(Unit* victim, uint32 damage, AuraEffect* triggere
                 // Glyph of Shred
                 case 54815:
                 {
+                    if(!target)
+                        return false;
+
                     // try to find spell Rip on the target
                     if (AuraEffect const* AurEff = target->GetAuraEffect(SPELL_AURA_PERIODIC_DAMAGE, SPELLFAMILY_DRUID, 0x00800000, 0x0, 0x0, GetGUID()))
                     {