diff --git a/src/main/java/com/glodblock/github/client/gui/GuiLevelTerminal.java b/src/main/java/com/glodblock/github/client/gui/GuiLevelTerminal.java
index 6f34df8c5..0cccefc9d 100644
--- a/src/main/java/com/glodblock/github/client/gui/GuiLevelTerminal.java
+++ b/src/main/java/com/glodblock/github/client/gui/GuiLevelTerminal.java
@@ -1386,7 +1386,8 @@ public boolean mouseClicked(int mouseX, int mouseY, int mouseButton) {
 
                 if (action != null) {
                     ItemStack itemStack = getInventory().getStackInSlot(slotIdx);
-                    if (itemStack.hasTagCompound() && itemStack.getTagCompound().hasKey(TLMTags.Stack.tagName)) {
+                    if (itemStack != null && itemStack.hasTagCompound()
+                            && itemStack.getTagCompound().hasKey(TLMTags.Stack.tagName)) {
                         long batch = itemStack.getTagCompound().getLong(TLMTags.Batch.tagName);
                         NBTTagCompound stackData = itemStack.getTagCompound().getCompoundTag(TLMTags.Stack.tagName);
                         ItemStack is = ItemStack.loadItemStackFromNBT(stackData);