diff --git a/binaries/data/mods/public/maps/random/rmgen/library.js b/binaries/data/mods/public/maps/random/rmgen/library.js
index 7d39e9fedc..4cd3a86946 100644
--- a/binaries/data/mods/public/maps/random/rmgen/library.js
+++ b/binaries/data/mods/public/maps/random/rmgen/library.js
@@ -290,9 +290,9 @@ function placeTerrain(x, z, terrain)
 	g_Map.placeTerrain(x, z, createTerrain(terrain));
 }
 
-function initTerrain(tileClass)
+function initTerrain(terrain)
 {
-	g_Map.initTerrain(createTerrain(tileClass));
+	g_Map.initTerrain(createTerrain(terrain));
 }
 
 function isCircularMap()
diff --git a/binaries/data/mods/public/maps/random/rmgen/map.js b/binaries/data/mods/public/maps/random/rmgen/map.js
index 9326e949a6..0d83f1eb9e 100644
--- a/binaries/data/mods/public/maps/random/rmgen/map.js
+++ b/binaries/data/mods/public/maps/random/rmgen/map.js
@@ -24,7 +24,7 @@ function Map(size, baseHeight)
 		this.area[i] = new Uint16Array(size);
 
 		for (let j = 0; j < size; ++j)
-			this.terrainObjects[i][j] = [];
+			this.terrainObjects[i][j] = undefined;
 	}
 
 	// Create 2D array for heightmap