From e9185650216f3c3fa97759caf67ee79db66cb5e1 Mon Sep 17 00:00:00 2001
From: Dimitri van Heesch <doxygen@gmail.com>
Date: Fri, 9 Apr 2021 20:30:52 +0200
Subject: issue #8474: Crash: double free or corruption (out)

---
 src/ftvhelp.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ftvhelp.cpp b/src/ftvhelp.cpp
index 7ef38c8..24e3fbb 100644
--- a/src/ftvhelp.cpp
+++ b/src/ftvhelp.cpp
@@ -701,7 +701,7 @@ static void generateJSNavTree(const std::vector<FTVNode*> &nodeList)
 
     // write the navigation index (and sub-indices)
     std::sort(navIndex.begin(),navIndex.end(),[](const auto &n1,const auto &n2)
-        { return qstrcmp(n1.url,n2.url)<0; });
+        { return !n1.url.isEmpty() && (n2.url.isEmpty() || qstrcmp(n1.url,n2.url)<0); });
 
     int subIndex=0;
     int elemCount=0;
-- 
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