From 9bd0ee5598e8a8a83319aa375124e666a91db0a3 Mon Sep 17 00:00:00 2001
From: droidicus <droidicus@users.noreply.github.com>
Date: Thu, 8 Sep 2016 19:59:12 -0400
Subject: [PATCH] Prevent ForgeCaps from being set with zero size (#421)

---
 src/main/java/mezz/jei/util/StackHelper.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/main/java/mezz/jei/util/StackHelper.java b/src/main/java/mezz/jei/util/StackHelper.java
index 2e971eabf..6ea44b7fe 100644
--- a/src/main/java/mezz/jei/util/StackHelper.java
+++ b/src/main/java/mezz/jei/util/StackHelper.java
@@ -389,7 +389,10 @@ public String getUniqueIdentifierForStack(@Nonnull ItemStack stack, @Nonnull Uid
 				if (nbtTagCompound == null) {
 					nbtTagCompound = new NBTTagCompound();
 				}
-				nbtTagCompound.setTag("ForgeCaps", serializedNbt.getCompoundTag("ForgeCaps"));
+				NBTTagCompound forgeCaps = serializedNbt.getCompoundTag("ForgeCaps");
+				if (!forgeCaps.hasNoTags()) { // ForgeCaps should never be empty
+					nbtTagCompound.setTag("ForgeCaps", forgeCaps);
+				}
 			}
 			if (nbtTagCompound != null && !nbtTagCompound.hasNoTags()) {
 				itemKey.append(':').append(nbtTagCompound);