1 files changed, 15 insertions, 0 deletions
diff --git a/src/main/java/gregtech/api/enums/OrePrefixes.java b/src/main/java/gregtech/api/enums/OrePrefixes.java
index 418fe71681..27cf37a2de 100644
--- a/src/main/java/gregtech/api/enums/OrePrefixes.java
+++ b/src/main/java/gregtech/api/enums/OrePrefixes.java
@@ -15,6 +15,7 @@ import net.minecraft.item.ItemStack;
 
 import com.google.common.collect.ImmutableList;
 
+import gregtech.api.GregTechAPI;
 import gregtech.api.enums.TCAspects.TC_AspectStack;
 import gregtech.api.interfaces.ICondition;
 import gregtech.api.interfaces.IOreRecipeRegistrator;
@@ -1179,6 +1180,8 @@ public enum OrePrefixes {
         } else if (name().startsWith("battery")) {
             new TC_AspectStack(TCAspects.ELECTRUM, 1).addToAspectList(mAspects);
         }
+
+        GregTechAPI.sGTCompleteLoad.add(this::onLoadComplete);
     }
 
     public static boolean isInstanceOf(String aName, OrePrefixes aPrefix) {
@@ -1297,12 +1300,20 @@ public enum OrePrefixes {
         return mOreProcessing.add(aRegistrator);
     }
 
+    // Hack to prevent duplicate registry of oredicted materials
+    HashSet<Materials> used = new HashSet<>();
+
     public void processOre(Materials aMaterial, String aOreDictName, String aModName, ItemStack aStack) {
 
         if (aMaterial == null) {
             return;
         }
 
+        if (aMaterial != Materials._NULL && !used.add(aMaterial)) {
+            GTLog.out.println("Duplicate material registry attempted by " + aModName + " for " + aOreDictName);
+            return;
+        }
+
         if (aMaterial.contains(SubTag.NO_RECIPES)) {
             return;
         }
@@ -1325,6 +1336,10 @@ public enum OrePrefixes {
         }
     }
 
+    public void onLoadComplete() {
+        used = null;
+    }
+
     public Object get(Object aMaterial) {
         if (aMaterial instanceof Materials) return new ItemData(this, (Materials) aMaterial);
         return name() + aMaterial;