diff --git a/src/rendering/hwrenderer/doom_levelmesh.cpp b/src/rendering/hwrenderer/doom_levelmesh.cpp
index 59d0f59bf..931c9485e 100644
--- a/src/rendering/hwrenderer/doom_levelmesh.cpp
+++ b/src/rendering/hwrenderer/doom_levelmesh.cpp
@@ -2036,7 +2036,7 @@ void DoomLevelMesh::SaveLightmapLump(FLevelLocals& doomMap)
 	for (unsigned int i = 0; i < Lightmap.Tiles.Size(); i++)
 	{
 		LightmapTile* tile = &Lightmap.Tiles[i];
-		if (tile->AtlasLocation.ArrayIndex != -1 || tile->AtlasLocation.ArrayIndex < Lightmap.TextureCount)
+		if (tile->AtlasLocation.ArrayIndex != -1 && tile->AtlasLocation.ArrayIndex < Lightmap.TextureCount)
 		{
 			tileCount++;
 			pixelCount += tile->AtlasLocation.Area();