diff --git a/source/Blocks/BlockDirt.h b/source/Blocks/BlockDirt.h
index 31d981cb2..9617a47da 100644
--- a/source/Blocks/BlockDirt.h
+++ b/source/Blocks/BlockDirt.h
@@ -51,15 +51,16 @@ public:
 	
 			BLOCKTYPE  DestBlock;
 			NIBBLETYPE DestMeta;
-			a_World->GetBlockTypeMeta(a_BlockX + OfsX, a_BlockY + OfsY, a_BlockZ + OfsZ, DestBlock, DestMeta);
-			if(DestBlock != E_BLOCK_DIRT)
+			bool IsValid = a_World->GetBlockTypeMeta(a_BlockX + OfsX, a_BlockY + OfsY, a_BlockZ + OfsZ, DestBlock, DestMeta);
+			if (!IsValid || (DestBlock != E_BLOCK_DIRT))
 			{
 				continue;
 			}
 
 			BLOCKTYPE AboveDest;
 			NIBBLETYPE AboveMeta;
-			a_World->GetBlockTypeMeta(a_BlockX + OfsX, a_BlockY + OfsY + 1, a_BlockZ + OfsZ, AboveDest, AboveMeta);
+			IsValid = a_World->GetBlockTypeMeta(a_BlockX + OfsX, a_BlockY + OfsY + 1, a_BlockZ + OfsZ, AboveDest, AboveMeta);
+			ASSERT(IsValid);  // WTF - how did we get the DestBlock if AboveBlock is not valid?
 			if (g_BlockOneHitDig[AboveDest] || g_BlockTransparent[AboveDest])
 			{
 				a_World->FastSetBlock(a_BlockX + OfsX, a_BlockY + OfsY, a_BlockZ + OfsZ, E_BLOCK_GRASS, 0);
diff --git a/source/ChunkMap.cpp b/source/ChunkMap.cpp
index 06b1d9039..bad47b066 100644
--- a/source/ChunkMap.cpp
+++ b/source/ChunkMap.cpp
@@ -972,7 +972,7 @@ void cChunkMap::SetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_B
 
 
 
-void cChunkMap::GetBlockTypeMeta(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta)
+bool cChunkMap::GetBlockTypeMeta(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta)
 {
 	int ChunkX, ChunkZ, X = a_BlockX, Y = a_BlockY, Z = a_BlockZ;
 	cChunkDef::AbsoluteToRelative( X, Y, Z, ChunkX, ChunkZ );
@@ -982,14 +982,16 @@ void cChunkMap::GetBlockTypeMeta(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCK
 	if ((Chunk != NULL) && Chunk->IsValid())
 	{
 		Chunk->GetBlockTypeMeta(X, Y, Z, a_BlockType, a_BlockMeta);
+		return true;
 	}
+	return false;
 }
 
 
 
 
 
-void cChunkMap::GetBlockInfo(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight)
+bool cChunkMap::GetBlockInfo(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight)
 {
 	int ChunkX, ChunkZ, X = a_BlockX, Y = a_BlockY, Z = a_BlockZ;
 	cChunkDef::AbsoluteToRelative( X, Y, Z, ChunkX, ChunkZ );
@@ -999,7 +1001,9 @@ void cChunkMap::GetBlockInfo(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE
 	if ((Chunk != NULL) && Chunk->IsValid())
 	{
 		Chunk->GetBlockInfo(X, Y, Z, a_BlockType, a_Meta, a_SkyLight, a_BlockLight);
+		return true;
 	}
+	return false;
 }
 
 
diff --git a/source/ChunkMap.h b/source/ChunkMap.h
index ea1aecfb4..15e786604 100644
--- a/source/ChunkMap.h
+++ b/source/ChunkMap.h
@@ -144,8 +144,8 @@ public:
 	NIBBLETYPE GetBlockBlockLight(int a_BlockX, int a_BlockY, int a_BlockZ);
 	void       SetBlockMeta      (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockMeta);
 	void       SetBlock          (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta);
-	void       GetBlockTypeMeta  (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta);
-	void       GetBlockInfo      (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight);
+	bool       GetBlockTypeMeta  (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta);
+	bool       GetBlockInfo      (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight);
 
 	/// Replaces world blocks with a_Blocks, if they are of type a_FilterBlockType
 	void      ReplaceBlocks(const sSetBlockVector & a_Blocks, BLOCKTYPE a_FilterBlockType);
diff --git a/source/World.cpp b/source/World.cpp
index 7d095971d..d785d1224 100644
--- a/source/World.cpp
+++ b/source/World.cpp
@@ -1136,18 +1136,18 @@ NIBBLETYPE cWorld::GetBlockBlockLight(int a_BlockX, int a_BlockY, int a_BlockZ)
 
 
 
-void cWorld::GetBlockTypeMeta(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta)
+bool cWorld::GetBlockTypeMeta(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta)
 {
-	m_ChunkMap->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, (BLOCKTYPE &)a_BlockType, (NIBBLETYPE &)a_BlockMeta);
+	return m_ChunkMap->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, (BLOCKTYPE &)a_BlockType, (NIBBLETYPE &)a_BlockMeta);
 }
 
 
 
 
 
-void cWorld::GetBlockInfo(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight)
+bool cWorld::GetBlockInfo(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight)
 {
-	m_ChunkMap->GetBlockInfo(a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_Meta, a_SkyLight, a_BlockLight);
+	return m_ChunkMap->GetBlockInfo(a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_Meta, a_SkyLight, a_BlockLight);
 }
 
 
diff --git a/source/World.h b/source/World.h
index b54e82662..af3143465 100644
--- a/source/World.h
+++ b/source/World.h
@@ -249,8 +249,8 @@ public:
 	void       SetBlockMeta      (int a_BlockX, int a_BlockY, int a_BlockZ, NIBBLETYPE a_MetaData);
 	NIBBLETYPE GetBlockSkyLight  (int a_BlockX, int a_BlockY, int a_BlockZ);
 	NIBBLETYPE GetBlockBlockLight(int a_BlockX, int a_BlockY, int a_BlockZ);
-	void       GetBlockTypeMeta  (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta);
-	void       GetBlockInfo      (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight);
+	bool       GetBlockTypeMeta  (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta);
+	bool       GetBlockInfo      (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight);
 	// TODO: NIBBLETYPE GetBlockActualLight(int a_BlockX, int a_BlockY, int a_BlockZ);
 
 	// Vector3i variants: