3 files changed, 28 insertions, 14 deletions

diff --git a/src/BlockEntities/DispenserEntity.cpp b/src/BlockEntities/DispenserEntity.cpp
index 42a0476b6..a847f1b65 100644
--- a/src/BlockEntities/DispenserEntity.cpp
+++ b/src/BlockEntities/DispenserEntity.cpp
@@ -105,7 +105,7 @@ void cDispenserEntity::DropSpenseFromSlot(cChunk & a_Chunk, int a_SlotNum)
 		{
 			double MobX = 0.5 + (DispX + DispChunk->GetPosX() * cChunkDef::Width);
 			double MobZ = 0.5 + (DispZ + DispChunk->GetPosZ() * cChunkDef::Width);
-			if (m_World->SpawnMob(MobX, DispY, MobZ, static_cast<eMonsterType>(m_Contents.GetSlot(a_SlotNum).m_ItemDamage)) >= 0)
+			if (m_World->SpawnMob(MobX, DispY, MobZ, static_cast<eMonsterType>(m_Contents.GetSlot(a_SlotNum).m_ItemDamage)) != cEntity::INVALID_ID)
 			{
 				m_Contents.ChangeSlotCount(a_SlotNum, -1);
 			}
@@ -144,29 +144,37 @@ void cDispenserEntity::DropSpenseFromSlot(cChunk & a_Chunk, int a_SlotNum)
 
 		case E_ITEM_FIRE_CHARGE:
 		{
-			SpawnProjectileFromDispenser(BlockX, DispY, BlockZ, cProjectileEntity::pkFireCharge, GetShootVector(Meta) * 20);
-			m_Contents.ChangeSlotCount(a_SlotNum, -1);
+			if (SpawnProjectileFromDispenser(BlockX, DispY, BlockZ, cProjectileEntity::pkFireCharge, GetShootVector(Meta) * 20) != cEntity::INVALID_ID)
+			{
+				m_Contents.ChangeSlotCount(a_SlotNum, -1);
+			}
 			break;
 		}
 
 		case E_ITEM_ARROW:
 		{
-			SpawnProjectileFromDispenser(BlockX, DispY, BlockZ, cProjectileEntity::pkArrow, GetShootVector(Meta) * 20 + Vector3d(0, 1, 0));
-			m_Contents.ChangeSlotCount(a_SlotNum, -1);
+			if (SpawnProjectileFromDispenser(BlockX, DispY, BlockZ, cProjectileEntity::pkArrow, GetShootVector(Meta) * 20 + Vector3d(0, 1, 0)) != cEntity::INVALID_ID)
+			{
+				m_Contents.ChangeSlotCount(a_SlotNum, -1);
+			}
 			break;
 		}
 
 		case E_ITEM_SNOWBALL:
 		{
-			SpawnProjectileFromDispenser(BlockX, DispY, BlockZ, cProjectileEntity::pkSnowball, GetShootVector(Meta) * 20 + Vector3d(0, 1, 0));
-			m_Contents.ChangeSlotCount(a_SlotNum, -1);
+			if (SpawnProjectileFromDispenser(BlockX, DispY, BlockZ, cProjectileEntity::pkSnowball, GetShootVector(Meta) * 20 + Vector3d(0, 1, 0)) != cEntity::INVALID_ID)
+			{
+				m_Contents.ChangeSlotCount(a_SlotNum, -1);
+			}
 			break;
 		}
 
 		case E_ITEM_EGG:
 		{
-			SpawnProjectileFromDispenser(BlockX, DispY, BlockZ, cProjectileEntity::pkEgg, GetShootVector(Meta) * 20 + Vector3d(0, 1, 0));
-			m_Contents.ChangeSlotCount(a_SlotNum, -1);
+			if (SpawnProjectileFromDispenser(BlockX, DispY, BlockZ, cProjectileEntity::pkEgg, GetShootVector(Meta) * 20 + Vector3d(0, 1, 0)) != cEntity::INVALID_ID)
+			{
+				m_Contents.ChangeSlotCount(a_SlotNum, -1);
+			}
 			break;
 		}
 
@@ -188,9 +196,14 @@ void cDispenserEntity::DropSpenseFromSlot(cChunk & a_Chunk, int a_SlotNum)
 
 
 
-void cDispenserEntity::SpawnProjectileFromDispenser(int a_BlockX, int a_BlockY, int a_BlockZ, cProjectileEntity::eKind a_Kind, const Vector3d & a_ShootVector)
+UInt32 cDispenserEntity::SpawnProjectileFromDispenser(int a_BlockX, int a_BlockY, int a_BlockZ, cProjectileEntity::eKind a_Kind, const Vector3d & a_ShootVector)
 {
-	m_World->CreateProjectile(static_cast<double>(a_BlockX + 0.5), static_cast<double>(a_BlockY + 0.5), static_cast<double>(a_BlockZ + 0.5), a_Kind, nullptr, nullptr, &a_ShootVector);
+	return m_World->CreateProjectile(
+		static_cast<double>(a_BlockX + 0.5),
+		static_cast<double>(a_BlockY + 0.5),
+		static_cast<double>(a_BlockZ + 0.5),
+		a_Kind, nullptr, nullptr, &a_ShootVector
+	);
 }
 
 
diff --git a/src/BlockEntities/DispenserEntity.h b/src/BlockEntities/DispenserEntity.h
index 12e12942a..62072d43b 100644
--- a/src/BlockEntities/DispenserEntity.h
+++ b/src/BlockEntities/DispenserEntity.h
@@ -24,8 +24,9 @@ public:
 
 	// tolua_begin
 	
-	/** Spawns a projectile of the given kind in front of the dispenser with the specified speed. */
-	void SpawnProjectileFromDispenser(int a_BlockX, int a_BlockY, int a_BlockZ, cProjectileEntity::eKind a_Kind, const Vector3d & a_Speed);
+	/** Spawns a projectile of the given kind in front of the dispenser with the specified speed.
+	Returns the UniqueID of the spawned projectile, or 0 on failure. */
+	UInt32 SpawnProjectileFromDispenser(int a_BlockX, int a_BlockY, int a_BlockZ, cProjectileEntity::eKind a_Kind, const Vector3d & a_Speed);
 
 	/** Returns a unit vector in the cardinal direction of where the dispenser is facing. */
 	Vector3d GetShootVector(NIBBLETYPE a_Meta);
diff --git a/src/BlockEntities/MobSpawnerEntity.cpp b/src/BlockEntities/MobSpawnerEntity.cpp
index 9b3f605f9..764d7af84 100644
--- a/src/BlockEntities/MobSpawnerEntity.cpp
+++ b/src/BlockEntities/MobSpawnerEntity.cpp
@@ -169,7 +169,7 @@ void cMobSpawnerEntity::SpawnEntity(void)
 
 					Monster->SetPosition(PosX, RelY, PosZ);
 					Monster->SetYaw(Random.NextFloat() * 360.0f);
-					if (Chunk->GetWorld()->SpawnMobFinalize(Monster) != mtInvalidType)
+					if (Chunk->GetWorld()->SpawnMobFinalize(Monster) != cEntity::INVALID_ID)
 					{
 						EntitiesSpawned = true;
 						Chunk->BroadcastSoundParticleEffect(2004, (int)(PosX * 8.0), (int)(RelY * 8.0), (int)(PosZ * 8.0), 0);