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-rw-r--r--src/Simulator/VanillaFluidSimulator.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Simulator/VanillaFluidSimulator.cpp b/src/Simulator/VanillaFluidSimulator.cpp
index 18d9b07e1..6df75eebb 100644
--- a/src/Simulator/VanillaFluidSimulator.cpp
+++ b/src/Simulator/VanillaFluidSimulator.cpp
@@ -98,7 +98,7 @@ int cVanillaFluidSimulator::CalculateFlowCost(cChunk * a_Chunk, int a_RelX, int
}
// Check if block below is passable
- if (!a_Chunk->UnboundedRelGetBlock(a_RelX, a_RelY - 1, a_RelZ, BlockType, BlockMeta))
+ if ((a_RelY > 0) && !a_Chunk->UnboundedRelGetBlock(a_RelX, a_RelY - 1, a_RelZ, BlockType, BlockMeta))
{
return Cost;
}