diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ProcessingArray.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ProcessingArray.java
index 3bc1edac..2b217481 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ProcessingArray.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ProcessingArray.java
@@ -19,6 +19,8 @@ import net.minecraftforge.fluids.FluidStack;
 import org.apache.commons.lang3.ArrayUtils;
 
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBlockBase {
@@ -204,9 +206,9 @@ public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBl
             tTier = 9;
             mMult=4;//u need 16x less machines and they will use 16x less power
         }else if (mInventory[1].getUnlocalizedName().endsWith("12") ||
-                mInventory[1].getUnlocalizedName().endsWith("13") ||
-                mInventory[1].getUnlocalizedName().endsWith("14") ||
-                mInventory[1].getUnlocalizedName().endsWith("15")) {
+                  mInventory[1].getUnlocalizedName().endsWith("13") ||
+                  mInventory[1].getUnlocalizedName().endsWith("14") ||
+                  mInventory[1].getUnlocalizedName().endsWith("15")) {
             tTier = 9;
             mMult=6;//u need 64x less machines and they will use 64x less power
         }else if (mInventory[1].getUnlocalizedName().endsWith("1")) {
@@ -281,8 +283,10 @@ public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBl
                 }
                 ItemStack[] tOut = new ItemStack[tRecipe.mOutputs.length];
                 for (int h = 0; h < tRecipe.mOutputs.length; h++) {
-                    tOut[h] = tRecipe.getOutput(h).copy();
-                    tOut[h].stackSize = 0;
+                    if(tRecipe.getOutput(h)!=null){
+                        tOut[h] = tRecipe.getOutput(h).copy();
+                        tOut[h].stackSize = 0;
+                    }
                 }
                 FluidStack tFOut = null;
                 if (tRecipe.getFluidOutput(0) != null) tFOut = tRecipe.getFluidOutput(0).copy();
@@ -298,14 +302,18 @@ public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBl
                     int tSize = tFOut.amount;
                     tFOut.amount = tSize * i;
                 }
+
+                tOut= clean(tOut);
                 this.mMaxProgresstime = Math.max(1, this.mMaxProgresstime);
                 List<ItemStack> overStacks = new ArrayList<ItemStack>();
                 for (int f = 0; f < tOut.length; f++) {
                     while (tOut[f].getMaxStackSize() < tOut[f].stackSize) {
-                        ItemStack tmp = tOut[f].copy();
-                        tmp.stackSize = tmp.getMaxStackSize();
-                        tOut[f].stackSize = tOut[f].stackSize - tOut[f].getMaxStackSize();
-                        overStacks.add(tmp);
+                        if(tOut[f]!=null) {
+                            ItemStack tmp = tOut[f].copy();
+                            tmp.stackSize = tmp.getMaxStackSize();
+                            tOut[f].stackSize = tOut[f].stackSize - tOut[f].getMaxStackSize();
+                            overStacks.add(tmp);
+                        }
                     }
                 }
                 if (overStacks.size() > 0) {
@@ -329,6 +337,12 @@ public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBl
         return false;
     }
 
+    public static ItemStack[] clean(final ItemStack[] v){
+        List<ItemStack> list = new ArrayList<ItemStack>(Arrays.asList(v));
+        list.removeAll(Collections.singleton(null));
+        return list.toArray(new ItemStack[list.size()]);
+    }
+
     public boolean checkMachine(IGregTechTileEntity aBaseMetaTileEntity, ItemStack aStack) {
         int xDir = ForgeDirection.getOrientation(aBaseMetaTileEntity.getBackFacing()).offsetX;
         int zDir = ForgeDirection.getOrientation(aBaseMetaTileEntity.getBackFacing()).offsetZ;