diff --git a/src/main/java/world/bentobox/caveblock/generators/populators/MaterialPopulator.java b/src/main/java/world/bentobox/caveblock/generators/populators/MaterialPopulator.java
index c8bb8a5..5c3d0ff 100644
--- a/src/main/java/world/bentobox/caveblock/generators/populators/MaterialPopulator.java
+++ b/src/main/java/world/bentobox/caveblock/generators/populators/MaterialPopulator.java
@@ -146,11 +146,13 @@ public class MaterialPopulator extends BlockPopulator
         filter(splitString -> splitString.length == 4).
         forEach(splitString -> {
             Material material = Material.getMaterial(splitString[1]);
-
-            if (material != null)
+            // Material must be a block otherwise the chunk cannot be populated
+            if (material != null && material.isBlock())
             {
                 materialMap.put(material,
                         new Pair<>(Double.parseDouble(splitString[2]), Integer.parseInt(splitString[3])));
+            } else {
+                addon.logError("Could not parse MATERIAL in config.yml: " + splitString[1] + " is not a valid block.");
             }
         });
 
diff --git a/src/main/resources/config.yml b/src/main/resources/config.yml
index dd5a831..14482ff 100644
--- a/src/main/resources/config.yml
+++ b/src/main/resources/config.yml
@@ -133,11 +133,11 @@ world:
     # MATERIAL:DIAMOND_ORE:100:5 - means there is 100% chace of spawing diamonds
     # where max amount in pack are 5 per each subchunk!
     blocks:
-    - MATERIAL:QUARTZ_ORE:30:5
+    - MATERIAL:NETHER_QUARTZ_ORE:30:5
     - MATERIAL:SOUL_SAND:40:10
     - MATERIAL:MAGMA_BLOCK:10:3
     - MATERIAL:GLOWSTONE:20:8
-    - MATERIAL:NETHER_BRICK:10:5
+    - MATERIAL:NETHER_BRICKS:10:5
     - MATERIAL:LAVA:10:1
     - ENTITY:MAGMA_CUBE:0.5:1
     - ENTITY:GHAST:0.1:1
@@ -166,7 +166,7 @@ world:
     blocks:
     - ENTITY:SHULKER:0.2:1
     - MATERIAL:OBSIDIAN:1:1
-    - MATERIAL:CHORUS_FRUIT:1:3
+    - MATERIAL:CHORUS_PLANT:1:3
   # Mob white list - these mobs will NOT be removed when logging in or doing /cave
   remove-mobs-whitelist:
   - WITHER