diff --git a/src/main/scala/li/cil/oc/integration/gregtech/ConverterDataStick.scala b/src/main/scala/li/cil/oc/integration/gregtech/ConverterDataStick.scala
index d1ce3c8ec..922095ede 100644
--- a/src/main/scala/li/cil/oc/integration/gregtech/ConverterDataStick.scala
+++ b/src/main/scala/li/cil/oc/integration/gregtech/ConverterDataStick.scala
@@ -16,39 +16,40 @@ class ConverterDataStick extends Converter {
   override def convert(value: Any, output: util.Map[AnyRef, AnyRef]): Unit = if (value.isInstanceOf[ItemStack]) {
     val stack = value.asInstanceOf[ItemStack]
     val nbt = stack.stackTagCompound
-    if (nbt.hasKey("prospection_tier"))
-      nbt.getString("title") match {
-        case "Raw Prospection Data" => getRawProspectionData(output, nbt)
-        case "Analyzed Prospection Data" => {
-          getRawProspectionData(output, nbt)
-          output += "Analyzed Prospection Data" ->
-            nbt.getTagList("pages", NBT.TAG_STRING)
-              .toArray[NBTTagString].map( (tag: NBTTagString) => tag.func_150285_a_().split('\n'))
+    if (nbt != null) {
+      if (nbt.hasKey("prospection_tier"))
+        nbt.getString("title") match {
+          case "Raw Prospection Data" => getRawProspectionData(output, nbt)
+          case "Analyzed Prospection Data" =>
+            getRawProspectionData(output, nbt)
+            output += "Analyzed Prospection Data" ->
+              nbt.getTagList("pages", NBT.TAG_STRING)
+                .toArray[NBTTagString].map((tag: NBTTagString) => tag.func_150285_a_().split('\n'))
+          case _ =>
         }
-        case _ =>
+      else if (nbt.hasKey("author") && nbt.getString("author") == "Assembling Line Recipe Generator" && nbt.hasKey("output")) {
+        val outputItem = ItemStack.loadItemStackFromNBT(nbt.getCompoundTag("output"))
+        output += "output" -> outputItem.getDisplayName
+        output += "time" -> nbt.getInteger("time").toString
+        output += "eu" -> nbt.getInteger("eu").toString
+        val inputs = new ArrayBuffer[ItemStack]()
+        var index = 0
+        while (nbt.hasKey(index.toString)) {
+          inputs += ItemStack.loadItemStackFromNBT(nbt.getCompoundTag(index.toString))
+          index += 1
+        }
+        output += "inputItems" -> inputs.map((s: ItemStack) => s.getDisplayName -> s.stackSize)
+        index = 0
+        val inputFluids = new ArrayBuffer[FluidStack]()
+        while (nbt.hasKey("f" + index)) {
+          inputFluids += FluidStack.loadFluidStackFromNBT(nbt.getCompoundTag("f" + index))
+          index += 1
+        }
+        output += "inputFluids" -> inputFluids.map((s: FluidStack) => s.getLocalizedName -> s.amount)
       }
-    else if (nbt.hasKey("author") && nbt.getString("author") == "Assembling Line Recipe Generator" && nbt.hasKey("output")) {
-      val outputItem = ItemStack.loadItemStackFromNBT(nbt.getCompoundTag("output"))
-      output += "output" -> outputItem.getDisplayName
-      output += "time" -> nbt.getInteger("time").toString
-      output += "eu" -> nbt.getInteger("eu").toString
-      val inputs = new ArrayBuffer[ItemStack]()
-      var index = 0
-      while (nbt.hasKey(index.toString)) {
-        inputs += ItemStack.loadItemStackFromNBT(nbt.getCompoundTag(index.toString))
-        index += 1
-      }
-      output += "inputItems" -> inputs.map((s:ItemStack) => s.getDisplayName -> s.stackSize)
-      index = 0
-      val inputFluids = new ArrayBuffer[FluidStack]()
-      while (nbt.hasKey("f" + index)) {
-        inputFluids += FluidStack.loadFluidStackFromNBT(nbt.getCompoundTag("f" + index))
-        index += 1
-      }
-      output += "inputFluids" -> inputFluids.map((s:FluidStack) => s.getLocalizedName -> s.amount)
     }
   }
-  def getRawProspectionData(output: util.Map[AnyRef, AnyRef], nbt: NBTTagCompound) =
+  private def getRawProspectionData(output: util.Map[AnyRef, AnyRef], nbt: NBTTagCompound) =
     output += "Raw Prospection Data" -> Map(
       "prospection_tier" -> nbt.getByte("prospection_tier"),
       "prospection_pos" -> nbt.getString("prospection_pos"),