3 files changed, 15 insertions, 12 deletions

diff --git a/src/Blocks/BlockFluid.h b/src/Blocks/BlockFluid.h
index 37885e4de..361b97c60 100644
--- a/src/Blocks/BlockFluid.h
+++ b/src/Blocks/BlockFluid.h
@@ -93,8 +93,8 @@ public:
 		// Check if it's fuel:
 		BLOCKTYPE BlockType;
 		if (
-			!a_Chunk.UnboundedRelGetBlockType(a_RelX + x, a_RelY + y, a_RelZ + z, BlockType) ||
-			!cFireSimulator::IsFuel(BlockType)
+			((a_RelY + y < 0) || (a_RelY + y > cChunkDef::Height)) ||
+			(!a_Chunk.UnboundedRelGetBlockType(a_RelX + x, a_RelY + y, a_RelZ + z, BlockType) || !cFireSimulator::IsFuel(BlockType))
 		)
 		{
 			return false;
@@ -119,6 +119,7 @@ public:
 		for (size_t i = 0; i < ARRAYCOUNT(CrossCoords); i++)
 		{
 			if (
+				((RelY + CrossCoords[i].y >= 0) && (RelY + CrossCoords[i].y <= cChunkDef::Height)) &&
 				a_Chunk.UnboundedRelGetBlockType(RelX + CrossCoords[i].x, RelY + CrossCoords[i].y, RelZ + CrossCoords[i].z, BlockType) &&
 				(BlockType == E_BLOCK_AIR)
 			)
diff --git a/src/MobSpawner.cpp b/src/MobSpawner.cpp
index a0d0f5c54..216681b48 100644
--- a/src/MobSpawner.cpp
+++ b/src/MobSpawner.cpp
@@ -129,6 +129,11 @@ bool cMobSpawner::CanSpawnHere(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_R
 	BLOCKTYPE TargetBlock = E_BLOCK_AIR;
 	if (m_AllowedTypes.find(a_MobType) != m_AllowedTypes.end() && a_Chunk->UnboundedRelGetBlockType(a_RelX, a_RelY, a_RelZ, TargetBlock))
 	{
+		if ((a_RelY + 1 > cChunkDef::Height) || (a_RelY - 1 < 0))
+		{
+			return false;
+		}
+
 		NIBBLETYPE BlockLight = a_Chunk->GetBlockLight(a_RelX, a_RelY, a_RelZ);
 		NIBBLETYPE SkyLight = a_Chunk->GetSkyLight(a_RelX, a_RelY, a_RelZ);
 		BLOCKTYPE BlockAbove = a_Chunk->GetBlock(a_RelX, a_RelY + 1, a_RelZ);
@@ -212,11 +217,8 @@ bool cMobSpawner::CanSpawnHere(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_R
 							return false;
 						}
 						HaveFloor = (
-							HaveFloor ||
-							(
-								a_Chunk->UnboundedRelGetBlockType(a_RelX + x, a_RelY - 1, a_RelZ + z, TargetBlock) &&
-								!cBlockInfo::IsTransparent(TargetBlock)
-							)
+							a_Chunk->UnboundedRelGetBlockType(a_RelX + x, a_RelY - 1 /* Checked at start of function */, a_RelZ + z, TargetBlock) &&
+							!cBlockInfo::IsTransparent(TargetBlock)
 						);
 					}
 				}
diff --git a/src/Mobs/Monster.cpp b/src/Mobs/Monster.cpp
index d3e0f1c26..83003006e 100644
--- a/src/Mobs/Monster.cpp
+++ b/src/Mobs/Monster.cpp
@@ -111,9 +111,9 @@ void cMonster::SpawnOn(cClientHandle & a_Client)
 
 void cMonster::TickPathFinding()
 {
-	int PosX = (int)floor(GetPosX());
-	int PosY = (int)floor(GetPosY());
-	int PosZ = (int)floor(GetPosZ());
+	const int PosX = (int)floor(GetPosX());
+	const int PosY = (int)floor(GetPosY());
+	const int PosZ = (int)floor(GetPosZ());
 
 	m_FinalDestination.y = (double)FindFirstNonAirBlockPosition(m_FinalDestination.x, m_FinalDestination.z);
 
@@ -133,9 +133,9 @@ void cMonster::TickPathFinding()
 
 	for (size_t i = 0; i < ARRAYCOUNT(gCrossCoords); i++)
 	{
-		if ((gCrossCoords[i].x + PosX == PosX) && (gCrossCoords[i].z + PosZ == PosZ))
+		if ((PosY - 1 < 0) || (PosY + 1 > cChunkDef::Height) || (PosY + 2 > cChunkDef::Height))
 		{
-			continue;
+			break;
 		}
 
 		if (IsCoordinateInTraversedList(Vector3i(gCrossCoords[i].x + PosX, PosY, gCrossCoords[i].z + PosZ)))