diff --git a/src/main/java/WayofTime/bloodmagic/routing/OreDictItemFilter.java b/src/main/java/WayofTime/bloodmagic/routing/OreDictItemFilter.java
index 812c4cc3..aa209492 100644
--- a/src/main/java/WayofTime/bloodmagic/routing/OreDictItemFilter.java
+++ b/src/main/java/WayofTime/bloodmagic/routing/OreDictItemFilter.java
@@ -17,6 +17,9 @@ public class OreDictItemFilter extends TestItemFilter {
 
     @Override
     public boolean doStacksMatch(ItemStack filterStack, ItemStack testStack) {
+        if (filterStack.isEmpty() || testStack.isEmpty())
+            return false;
+
         int[] filterIds = OreDictionary.getOreIDs(filterStack);
         int[] testIds = OreDictionary.getOreIDs(testStack);