5 files changed, 6 insertions, 6 deletions

diff --git a/src/Blocks/BlockBigFlower.h b/src/Blocks/BlockBigFlower.h
index 5240ddf53..6c5cc6b68 100644
--- a/src/Blocks/BlockBigFlower.h
+++ b/src/Blocks/BlockBigFlower.h
@@ -81,7 +81,7 @@ public:
 
 	virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, int a_RelX, int a_RelY, int a_RelZ, const cChunk & a_Chunk) override
 	{
-		return ((a_RelY > 0) && (a_Chunk.GetBlock(a_RelX, a_RelY - 1, a_RelZ) != E_BLOCK_AIR) && (a_RelY < cChunkDef::Height) && ((a_Chunk.GetBlock(a_RelX, a_RelY + 1, a_RelZ) == E_BLOCK_AIR) || (a_Chunk.GetBlock(a_RelX, a_RelY + 1, a_RelZ) == E_BLOCK_BIG_FLOWER)));
+		return ((a_RelY > 0) && (a_Chunk.GetBlock(a_RelX, a_RelY - 1, a_RelZ) != E_BLOCK_AIR) && (a_RelY < cChunkDef::Height - 1) && ((a_Chunk.GetBlock(a_RelX, a_RelY + 1, a_RelZ) == E_BLOCK_AIR) || (a_Chunk.GetBlock(a_RelX, a_RelY + 1, a_RelZ) == E_BLOCK_BIG_FLOWER)));
 	}
 
 
diff --git a/src/Blocks/BlockDirt.h b/src/Blocks/BlockDirt.h
index cc0d845e4..32512a2ef 100644
--- a/src/Blocks/BlockDirt.h
+++ b/src/Blocks/BlockDirt.h
@@ -59,7 +59,7 @@ public:
 			a_Chunk.GetWorld()->QueueLightChunk(a_Chunk.GetPosX(), a_Chunk.GetPosZ());
 			return;
 		}
-		else if (std::max(a_Chunk.GetBlockLight(a_RelX, a_RelY + 1, a_RelZ), a_Chunk.GetTimeAlteredLight(a_Chunk.GetSkyLight(a_RelX, a_RelY + 1, a_RelZ))) < 9)
+		else if ((a_RelY < cChunkDef::Height - 1) && std::max(a_Chunk.GetBlockLight(a_RelX, a_RelY + 1, a_RelZ), a_Chunk.GetTimeAlteredLight(a_Chunk.GetSkyLight(a_RelX, a_RelY + 1, a_RelZ))) < 9)
 		{
 			// Source block is not bright enough to spread
 			return;
diff --git a/src/Blocks/BlockFarmland.h b/src/Blocks/BlockFarmland.h
index 02a48a4af..23a7392da 100644
--- a/src/Blocks/BlockFarmland.h
+++ b/src/Blocks/BlockFarmland.h
@@ -45,7 +45,7 @@ public:
 		}
 
 		// Farmland too dry. If nothing is growing on top, turn back to dirt:
-		BLOCKTYPE UpperBlock = (a_RelY >= cChunkDef::Height) ? E_BLOCK_AIR : a_Chunk.GetBlock(a_RelX, a_RelY + 1, a_RelZ);
+		BLOCKTYPE UpperBlock = (a_RelY >= cChunkDef::Height - 1) ? E_BLOCK_AIR : a_Chunk.GetBlock(a_RelX, a_RelY + 1, a_RelZ);
 		switch (UpperBlock)
 		{
 			case E_BLOCK_CROPS:
diff --git a/src/Blocks/BlockFluid.h b/src/Blocks/BlockFluid.h
index 8c0aae041..2823baedc 100644
--- a/src/Blocks/BlockFluid.h
+++ b/src/Blocks/BlockFluid.h
@@ -99,7 +99,7 @@ public:
 		// Check if it's fuel:
 		BLOCKTYPE BlockType;
 		if (
-			((a_RelY + y < 0) || (a_RelY + y > cChunkDef::Height)) ||
+			((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)
 		)
@@ -126,7 +126,7 @@ public:
 		for (size_t i = 0; i < ARRAYCOUNT(CrossCoords); i++)
 		{
 			if (
-				((RelY + CrossCoords[i].y >= 0) && (RelY + CrossCoords[i].y <= cChunkDef::Height)) &&
+				((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/Blocks/BlockPortal.h b/src/Blocks/BlockPortal.h
index 97ba26ee3..581a29447 100644
--- a/src/Blocks/BlockPortal.h
+++ b/src/Blocks/BlockPortal.h
@@ -55,7 +55,7 @@ public:
 
 	virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, int a_RelX, int a_RelY, int a_RelZ, const cChunk & a_Chunk) override
 	{
-		if ((a_RelY <= 0) || (a_RelY >= cChunkDef::Height))
+		if ((a_RelY <= 0) || (a_RelY >= cChunkDef::Height - 1))
 		{
 			return false;  // In case someone places a portal with meta 1 or 2 at boundaries, and server tries to get invalid coords at Y - 1 or Y + 1
 		}