diff --git a/mods/MAPGEN/mcl_mapgen_core/init.lua b/mods/MAPGEN/mcl_mapgen_core/init.lua
index aba50cdfd..470f2a8c6 100644
--- a/mods/MAPGEN/mcl_mapgen_core/init.lua
+++ b/mods/MAPGEN/mcl_mapgen_core/init.lua
@@ -280,7 +280,7 @@ local function set_palette(minp,maxp,data2,area,biomemap,nodes)
 		local bn = minetest.get_biome_name(biomemap[b_pos])
 		if bn then
 			local biome = minetest.registered_biomes[bn]
-			if biome and biome._mcl_biome_type then
+			if biome and biome._mcl_biome_type and biome._mcl_grass_palette_index then
 				data2[p_pos] = biome._mcl_grass_palette_index
 				lvm_used = true
 			end