2 files changed, 15 insertions, 5 deletions

diff --git a/src/Mobs/Monster.cpp b/src/Mobs/Monster.cpp
index a4cb9e63f..3b0fdd36c 100644
--- a/src/Mobs/Monster.cpp
+++ b/src/Mobs/Monster.cpp
@@ -667,10 +667,14 @@ void cMonster::InStateIdle(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 			NIBBLETYPE BlockMeta;
 			int RelX = static_cast<int>(Destination.x) - Chunk->GetPosX() * cChunkDef::Width;
 			int RelZ = static_cast<int>(Destination.z) - Chunk->GetPosZ() * cChunkDef::Width;
-			Chunk->GetBlockTypeMeta(RelX, static_cast<int>(Destination.y) - 1, RelZ, BlockType, BlockMeta);
-			if (BlockType != E_BLOCK_STATIONARY_WATER)  // Idle mobs shouldn't enter water on purpose
+			int YBelowUs = static_cast<int>(Destination.y) - 1;
+			if (YBelowUs >= 0)
 			{
-				MoveToPosition(Destination);
+				Chunk->GetBlockTypeMeta(RelX, YBelowUs, RelZ, BlockType, BlockMeta);
+				if (BlockType != E_BLOCK_STATIONARY_WATER)  // Idle mobs shouldn't enter water on purpose
+				{
+					MoveToPosition(Destination);
+				}
 			}
 		}
 	}
diff --git a/src/Mobs/PathFinder.cpp b/src/Mobs/PathFinder.cpp
index 4b6e70bbd..93664b596 100644
--- a/src/Mobs/PathFinder.cpp
+++ b/src/Mobs/PathFinder.cpp
@@ -196,7 +196,13 @@ bool cPathFinder::EnsureProperPoint(Vector3d & a_Vector, cChunk & a_Chunk)
 	// If destination in the air, first try to go 1 block north, or east, or west.
 	// This fixes the player leaning issue.
 	// If that failed, we instead go down to the lowest air block.
-	Chunk->GetBlockTypeMeta(RelX, FloorC(a_Vector.y) - 1, RelZ, BlockType, BlockMeta);
+	int YBelowUs = FloorC(a_Vector.y) - 1;
+	if (YBelowUs < 0)
+	{
+		return false;
+
+	}
+	Chunk->GetBlockTypeMeta(RelX, YBelowUs, RelZ, BlockType, BlockMeta);
 	if (!(IsWaterOrSolid(BlockType)))
 	{
 		bool InTheAir = true;
@@ -216,7 +222,7 @@ bool cPathFinder::EnsureProperPoint(Vector3d & a_Vector, cChunk & a_Chunk)
 				}
 				RelX = FloorC(a_Vector.x+x) - Chunk->GetPosX() * cChunkDef::Width;
 				RelZ = FloorC(a_Vector.z+z) - Chunk->GetPosZ() * cChunkDef::Width;
-				Chunk->GetBlockTypeMeta(RelX, FloorC(a_Vector.y) - 1, RelZ, BlockType, BlockMeta);
+				Chunk->GetBlockTypeMeta(RelX, YBelowUs, RelZ, BlockType, BlockMeta);
 				if (IsWaterOrSolid((BlockType)))
 				{
 					a_Vector.x += x;