diff --git a/src/main/java/com/gregtechceu/gtceu/api/machine/WorkableTieredMachine.java b/src/main/java/com/gregtechceu/gtceu/api/machine/WorkableTieredMachine.java
index f5b2553f098..21003c7e09e 100644
--- a/src/main/java/com/gregtechceu/gtceu/api/machine/WorkableTieredMachine.java
+++ b/src/main/java/com/gregtechceu/gtceu/api/machine/WorkableTieredMachine.java
@@ -197,7 +197,8 @@ public boolean keepSubscribing() {
     }
 
     public GTRecipeType getRecipeType() {
-        return recipeTypes[activeRecipeType];
+        int index = activeRecipeType >= 0 && activeRecipeType < recipeTypes.length ? activeRecipeType : 0;
+        return recipeTypes[index];
     }
 
     /**
diff --git a/src/main/java/com/gregtechceu/gtceu/api/machine/multiblock/WorkableMultiblockMachine.java b/src/main/java/com/gregtechceu/gtceu/api/machine/multiblock/WorkableMultiblockMachine.java
index 1026e857dba..5e7763919cf 100644
--- a/src/main/java/com/gregtechceu/gtceu/api/machine/multiblock/WorkableMultiblockMachine.java
+++ b/src/main/java/com/gregtechceu/gtceu/api/machine/multiblock/WorkableMultiblockMachine.java
@@ -290,7 +290,8 @@ public void setWorkingEnabled(boolean isWorkingAllowed) {
     }
 
     public GTRecipeType getRecipeType() {
-        return recipeTypes[activeRecipeType];
+        int index = activeRecipeType >= 0 && activeRecipeType < recipeTypes.length ? activeRecipeType : 0;
+        return recipeTypes[index];
     }
 
     /**