diff --git a/src/ChunkData.cpp b/src/ChunkData.cpp
index f8c4a851d..0cacaf02d 100644
--- a/src/ChunkData.cpp
+++ b/src/ChunkData.cpp
@@ -7,7 +7,7 @@ cChunkData cChunkData::Copy() const
 	cChunkData copy;
 	for (int i = 0; i < CHUNK_SECTION_NUM; i++)
 	{
-		if(m_Sections[i] == NULL)
+		if(m_Sections[i] != NULL)
 		{
 			copy.m_Sections[i] = Allocate();
 			*copy.m_Sections[i] = *m_Sections[i];
@@ -30,7 +30,7 @@ void cChunkData::CopyBlocks   (BLOCKTYPE * a_dest, size_t a_Idx, size_t length)
 		{
 			size_t tocopy = length > segment_length ? segment_length : length;
 			length -= tocopy;
-			if(m_Sections[i] == NULL)
+			if(m_Sections[i] != NULL)
 			{
 				memcpy(
 					&a_dest[i * segment_length],
@@ -59,7 +59,7 @@ void cChunkData::CopyMeta(NIBBLETYPE * a_dest) const
 	for (size_t i = 0; i < CHUNK_SECTION_NUM; i++)
 	{
 		const size_t segment_length = CHUNK_SECTION_HEIGHT * 16 * 16 / 2;
-		if(m_Sections[i] == NULL)
+		if(m_Sections[i] != NULL)
 		{
 			memcpy(
 				&a_dest[i * segment_length], 
@@ -86,7 +86,7 @@ void cChunkData::CopyLight(NIBBLETYPE * a_dest) const
 	for (size_t i = 0; i < CHUNK_SECTION_NUM; i++)
 	{
 		const size_t segment_length = CHUNK_SECTION_HEIGHT * 16 * 16 / 2;
-		if(m_Sections[i] == NULL)
+		if(m_Sections[i] != NULL)
 		{
 			memcpy(
 				&a_dest[i * segment_length],
@@ -114,7 +114,7 @@ void cChunkData::CopySkyLight(NIBBLETYPE * a_dest) const
 	for (size_t i = 0; i < CHUNK_SECTION_NUM; i++)
 	{
 		const size_t segment_length = CHUNK_SECTION_HEIGHT * 16 * 16 / 2;
-		if(m_Sections[i] == NULL)
+		if(m_Sections[i] != NULL)
 		{
 			memcpy(
 				&a_dest[i * segment_length],
@@ -142,7 +142,7 @@ void cChunkData::SetBlocks(const BLOCKTYPE * a_src)
 	for (size_t i = 0; i < CHUNK_SECTION_NUM; i++)
 	{
 		const size_t segment_length = CHUNK_SECTION_HEIGHT * 16 * 16;
-		if (m_Sections[i] == NULL)
+		if (m_Sections[i] != NULL)
 		{
 			memcpy(
 				&m_Sections[i]->m_BlockTypes,
@@ -196,7 +196,7 @@ void cChunkData::SetMeta(const NIBBLETYPE * a_src)
 	for (size_t i = 0; i < CHUNK_SECTION_NUM; i++)
 	{
 		const size_t segment_length = CHUNK_SECTION_HEIGHT * 16 * 16 / 2;
-		if (m_Sections[i] == NULL)
+		if (m_Sections[i] != NULL)
 		{
 			memcpy(
 				&m_Sections[i]->m_BlockMeta, 
@@ -251,7 +251,7 @@ void cChunkData::SetLight(const NIBBLETYPE * a_src)
 	for (size_t i = 0; i < CHUNK_SECTION_NUM; i++)
 	{
 		const size_t segment_length = CHUNK_SECTION_HEIGHT * 16 * 16 / 2;
-		if (m_Sections[i] == NULL)
+		if (m_Sections[i] != NULL)
 		{
 			memcpy(
 				&m_Sections[i]->m_BlockLight,
@@ -306,7 +306,7 @@ void cChunkData::SetSkyLight  (const NIBBLETYPE * a_src)
 	for (size_t i = 0; i < CHUNK_SECTION_NUM; i++)
 	{
 		const size_t segment_length = CHUNK_SECTION_HEIGHT * 16 * 16 / 2;
-		if (m_Sections[i] == NULL)
+		if (m_Sections[i] != NULL)
 		{
 			memcpy(
 				&m_Sections[i]->m_BlockSkyLight,
diff --git a/src/ChunkData.h b/src/ChunkData.h
index 73b1e8c6a..51244225b 100644
--- a/src/ChunkData.h
+++ b/src/ChunkData.h
@@ -106,7 +106,7 @@ public:
 		ASSERT((a_Y >= 0) && (a_Y < cChunkDef::Height));
 		ASSERT((a_Z >= 0) && (a_Z < cChunkDef::Width));
 		int Section = a_Y / CHUNK_SECTION_HEIGHT;
-		if(m_Sections[Section] == NULL)
+		if(m_Sections[Section] != NULL)
 		{
 			int Index = cChunkDef::MakeIndexNoCheck(a_X, a_Y - (Section * CHUNK_SECTION_HEIGHT), a_Z);
 			return m_Sections[Section]->m_BlockTypes[Index];
@@ -130,14 +130,14 @@ public:
 		}
 
 		int Section = a_RelY / CHUNK_SECTION_HEIGHT;
-		if(m_Sections[Section] != NULL)
+		if(m_Sections[Section] == NULL)
 		{
 			if(a_Block == 0x00)
 			{
 				return;
 			}
 			m_Sections[Section] = Allocate();
-			if(m_Sections[Section] != NULL)
+			if(m_Sections[Section] == NULL)
 			{
 				ASSERT(!"Failed to allocate a new section in Chunkbuffer");
 				return;
@@ -153,7 +153,7 @@ public:
 		if ((a_RelX < cChunkDef::Width) && (a_RelX > -1) && (a_RelY < cChunkDef::Height) && (a_RelY > -1) && (a_RelZ < cChunkDef::Width) && (a_RelZ > -1))
 		{
 			int Section = a_RelY / CHUNK_SECTION_HEIGHT;
-			if(m_Sections[Section] == NULL)
+			if(m_Sections[Section] != NULL)
 			{
 				int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * CHUNK_SECTION_HEIGHT), a_RelZ);
 				return (m_Sections[Section]->m_BlockMeta[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
@@ -180,14 +180,14 @@ public:
 		}
 
 		int Section = a_RelY / CHUNK_SECTION_HEIGHT;
-		if(m_Sections[Section] != NULL)
+		if(m_Sections[Section] == NULL)
 		{
 			if((a_Nibble & 0xf) == 0x00)
 			{
 				return false;
 			}
 			m_Sections[Section] = Allocate();
-			if(m_Sections[Section] != NULL)
+			if(m_Sections[Section] == NULL)
 			{
 				ASSERT(!"Failed to allocate a new section in Chunkbuffer");
 				return false;
@@ -208,7 +208,7 @@ public:
 		if ((a_RelX < cChunkDef::Width) && (a_RelX > -1) && (a_RelY < cChunkDef::Height) && (a_RelY > -1) && (a_RelZ < cChunkDef::Width) && (a_RelZ > -1))
 		{
 			int Section = a_RelY / CHUNK_SECTION_HEIGHT;
-			if(m_Sections[Section] == NULL)
+			if(m_Sections[Section] != NULL)
 			{
 				int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * CHUNK_SECTION_HEIGHT), a_RelZ);
 				return (m_Sections[Section]->m_BlockLight[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
@@ -227,7 +227,7 @@ public:
 		if ((a_RelX < cChunkDef::Width) && (a_RelX > -1) && (a_RelY < cChunkDef::Height) && (a_RelY > -1) && (a_RelZ < cChunkDef::Width) && (a_RelZ > -1))
 		{
 			int Section = a_RelY / CHUNK_SECTION_HEIGHT;
-			if(m_Sections[Section] == NULL)
+			if(m_Sections[Section] != NULL)
 			{
 				int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * CHUNK_SECTION_HEIGHT), a_RelZ);
 				return (m_Sections[Section]->m_BlockLight[Index / 2] >> ((Index & 1) * 4)) & 0x0f;