From 62f8c5346b2f3ea492404ae85942a0de4b091c71 Mon Sep 17 00:00:00 2001
From: albert-github <albert.tests@gmail.com>
Date: Tue, 4 Dec 2018 13:17:19 +0100
Subject: issue #6657 "QGDict::hashAsciiKey: Invalid null key" when using
 anonymous union/struct

Protect findAt against empty string.
---
 src/groupdef.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/groupdef.cpp b/src/groupdef.cpp
index e918b1f..9df3ae1 100644
--- a/src/groupdef.cpp
+++ b/src/groupdef.cpp
@@ -170,7 +170,8 @@ bool GroupDef::addClass(const ClassDef *cd)
         // add nested classes (e.g. A::B, A::C) after their parent (A) in 
         // order of insertion
         QCString scope = qn.left(i);
-        int j=classSDict->findAt(scope);
+        int j=-1;
+        if (!scope.isEmpty()) j=classSDict->findAt(scope);
         if (j!=-1)
         {
           while (j<(int)classSDict->count() && 
-- 
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