2 files changed, 7 insertions, 5 deletions

diff --git a/src/Mobs/Monster.cpp b/src/Mobs/Monster.cpp
index bcdc404c2..4f8afa0de 100644
--- a/src/Mobs/Monster.cpp
+++ b/src/Mobs/Monster.cpp
@@ -159,7 +159,7 @@ void cMonster::TickPathFinding()
 		BLOCKTYPE BlockAtYP = m_World->GetBlock(gCrossCoords[i].x + PosX, PosY + 1, gCrossCoords[i].z + PosZ);
 		BLOCKTYPE BlockAtYPP = m_World->GetBlock(gCrossCoords[i].x + PosX, PosY + 2, gCrossCoords[i].z + PosZ);
 		int LowestY = FindFirstNonAirBlockPosition(gCrossCoords[i].x + PosX, gCrossCoords[i].z + PosZ);
-		BLOCKTYPE BlockAtLowestY = m_World->GetBlock(gCrossCoords[i].x + PosX, LowestY, gCrossCoords[i].z + PosZ);
+		BLOCKTYPE BlockAtLowestY = (LowestY >= cChunkDef::Height) ? E_BLOCK_AIR : m_World->GetBlock(gCrossCoords[i].x + PosX, LowestY, gCrossCoords[i].z + PosZ);
 
 		if (
 			(!cBlockInfo::IsSolid(BlockAtY)) &&
@@ -452,7 +452,7 @@ int cMonster::FindFirstNonAirBlockPosition(double a_PosX, double a_PosZ)
 	}
 	else
 	{
-		while (cBlockInfo::IsSolid(m_World->GetBlock((int)floor(a_PosX), PosY, (int)floor(a_PosZ))) && (PosY < cChunkDef::Height))
+		while ((PosY < cChunkDef::Height) && cBlockInfo::IsSolid(m_World->GetBlock((int)floor(a_PosX), PosY, (int)floor(a_PosZ))))
 		{
 			PosY++;
 		}
diff --git a/src/Mobs/Monster.h b/src/Mobs/Monster.h
index f5ae2cb4d..e5dcb0309 100644
--- a/src/Mobs/Monster.h
+++ b/src/Mobs/Monster.h
@@ -169,10 +169,12 @@ protected:
 	/** Stores if mobile is currently moving towards the ultimate, final destination */
 	bool m_bMovingToDestination;
 
-	/** Finds the first non-air block position (not the highest, as cWorld::GetHeight does)
-		If current Y is nonsolid, goes down to try to find a solid block, then returns that + 1
-		If current Y is solid, goes up to find first nonsolid block, and returns that */
+	/** Finds the lowest non-air block position (not the highest, as cWorld::GetHeight does)
+	If current Y is nonsolid, goes down to try to find a solid block, then returns that + 1
+	If current Y is solid, goes up to find first nonsolid block, and returns that.
+	If no suitable position is found, returns cChunkDef::Height. */
 	int FindFirstNonAirBlockPosition(double a_PosX, double a_PosZ);
+
 	/** Returns if a monster can actually reach a given height by jumping or walking */
 	inline bool IsNextYPosReachable(int a_PosY)
 	{