diff --git a/src/main/java/WayofTime/bloodmagic/tile/TileDemonCrucible.java b/src/main/java/WayofTime/bloodmagic/tile/TileDemonCrucible.java
index 7685e0fc..52ff0be5 100644
--- a/src/main/java/WayofTime/bloodmagic/tile/TileDemonCrucible.java
+++ b/src/main/java/WayofTime/bloodmagic/tile/TileDemonCrucible.java
@@ -204,7 +204,7 @@ public class TileDemonCrucible extends TileInventory implements ITickable, IDemo
 
     @Override
     public boolean canInsertItem(int index, ItemStack stack, EnumFacing direction) {
-        return !stack.isEmpty() && (stack.getItem() instanceof IDemonWillGem || stack.getItem() instanceof IDiscreteDemonWill);
+        return !stack.isEmpty() && inventory.get(0).isEmpty() && (stack.getItem() instanceof IDemonWillGem || stack.getItem() instanceof IDiscreteDemonWill);
     }
 
     @Override