From a4091454ec4e1f0ae9f982a92ad7d4b59ce10a56 Mon Sep 17 00:00:00 2001
From: PCigales <58741513+PCigales@users.noreply.github.com>
Date: Sun, 15 Oct 2023 02:38:35 +0200
Subject: [PATCH] Fix

---
 GPXTweaker.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/GPXTweaker.py b/GPXTweaker.py
index 8f944f9..85bfa61 100644
--- a/GPXTweaker.py
+++ b/GPXTweaker.py
@@ -8196,7 +8196,7 @@ class GPXTweakerWebInterfaceServer():
   '        if (t.status != 200) {\r\n' \
   '          document.getElementById("tset").selectedIndex = tset;\r\n' \
   '          if (nset == null) {\r\n' \
-  '            tlevel = nlevel;\r\n' \
+  '            tlevel = nlevel || 1;\r\n' \
   '            layers = [];\r\n' \
   '            if (treset == 2) {set_jmaps();}\r\n' \
   '            for (const jmap of jmaps) {\r\n' \