Core/Scripts: added nullptr checks to DamageTaken hooks

Since cb9e72e521d3cc415dd15bf6912c87f89e41b92a attacker may not be in world when hook is called

(cherry picked from commit 0db5c2df3fe56f42293865e87ec781cd4d41598b)

3 files changed, 5 insertions, 4 deletions

diff --git a/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/hyjal_trash.cpp b/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/hyjal_trash.cpp
index 30445f19871..72fa7dcf141 100644
--- a/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/hyjal_trash.cpp
+++ b/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/hyjal_trash.cpp
@@ -194,7 +194,7 @@ hyjal_trashAI::hyjal_trashAI(Creature* creature) : EscortAI(creature)
 
 void hyjal_trashAI::DamageTaken(Unit* done_by, uint32 &damage)
 {
-    if (done_by->GetTypeId() == TYPEID_PLAYER || done_by->IsPet())
+    if (!done_by || done_by->GetTypeId() == TYPEID_PLAYER || done_by->IsPet())
     {
         damageTaken += damage;
         instance->SetData(DATA_RAIDDAMAGE, damage);//store raid's damage
diff --git a/src/server/scripts/Kalimdor/TempleOfAhnQiraj/boss_viscidus.cpp b/src/server/scripts/Kalimdor/TempleOfAhnQiraj/boss_viscidus.cpp
index 6fa10647d47..c28cc669ba5 100644
--- a/src/server/scripts/Kalimdor/TempleOfAhnQiraj/boss_viscidus.cpp
+++ b/src/server/scripts/Kalimdor/TempleOfAhnQiraj/boss_viscidus.cpp
@@ -119,7 +119,7 @@ class boss_viscidus : public CreatureScript
 
                 ++_hitcounter;
 
-                if (attacker->HasUnitState(UNIT_STATE_MELEE_ATTACKING) && _hitcounter >= HITCOUNTER_EXPLODE)
+                if (attacker && attacker->HasUnitState(UNIT_STATE_MELEE_ATTACKING) && _hitcounter >= HITCOUNTER_EXPLODE)
                 {
                     Talk(EMOTE_EXPLODE);
                     events.Reset();
diff --git a/src/server/scripts/Kalimdor/zone_dustwallow_marsh.cpp b/src/server/scripts/Kalimdor/zone_dustwallow_marsh.cpp
index 6c96f6934d4..c5cf1f86109 100644
--- a/src/server/scripts/Kalimdor/zone_dustwallow_marsh.cpp
+++ b/src/server/scripts/Kalimdor/zone_dustwallow_marsh.cpp
@@ -126,8 +126,9 @@ public:
             {
                 Damage = 0;
 
-                if (Player* player = pDoneBy->GetCharmerOrOwnerPlayerOrPlayerItself())
-                    player->GroupEventHappens(QUEST_MISSING_DIPLO_PT16, me);
+                if (pDoneBy)
+                    if (Player* player = pDoneBy->GetCharmerOrOwnerPlayerOrPlayerItself())
+                        player->GroupEventHappens(QUEST_MISSING_DIPLO_PT16, me);
 
                 Talk(EMOTE_SURRENDER);
                 EnterEvadeMode();