From 33f03a415938ae4c838a0e4efa0cfc364b2947a8 Mon Sep 17 00:00:00 2001
From: Motokoder <motokoder@tutanota.com>
Date: Sat, 7 Oct 2023 00:00:46 -0600
Subject: [PATCH] ENG-1981 fix error when uploading first library file

---
 src/methods/nft/nft.ts | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/src/methods/nft/nft.ts b/src/methods/nft/nft.ts
index 660aaa6..75e4677 100644
--- a/src/methods/nft/nft.ts
+++ b/src/methods/nft/nft.ts
@@ -328,15 +328,17 @@ const buildLibraryMetadata = async (
 
   // get highest sort value
   let maxSort = 0n;
-  for (const library of nftLibraries) {
-    const sortAttrib = getAttribute(library, 'sort');
-    if (sortAttrib) {
-      const sort = (sortAttrib.value as NatValue)?.Nat || 0n;
-      maxSort = sort > maxSort ? sort : maxSort;
+  if (nftLibraries?.length) {
+    for (const library of nftLibraries) {
+      const sortAttrib = getAttribute(library, 'sort');
+      if (sortAttrib) {
+        const sort = (sortAttrib.value as NatValue)?.Nat || 0n;
+        maxSort = sort > maxSort ? sort : maxSort;
+      }
+    }
+    if (maxSort < nftLibraries.length + 1) {
+      maxSort = BigInt(nftLibraries.length + 1);
     }
-  }
-  if (maxSort < nftLibraries.length + 1) {
-    maxSort = BigInt(nftLibraries.length + 1);
   }
 
   const attribs: PropertyShared[] = [];