From 12efa030fe1d3320954915db57853ee9c4189ab1 Mon Sep 17 00:00:00 2001
From: Jan Sundermeyer <sunderme@gmx.de>
Date: Wed, 8 Jan 2025 18:15:44 +0100
Subject: [PATCH] fix #3936

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

diff --git a/src/latexparser/latexparsing.cpp b/src/latexparser/latexparsing.cpp
index 3aa291569..139281651 100644
--- a/src/latexparser/latexparsing.cpp
+++ b/src/latexparser/latexparsing.cpp
@@ -695,7 +695,7 @@ bool latexDetermineContexts2(QDocumentLineHandle *dlh, TokenStack &stack, Comman
                 //lastComma = -1;
                 lastEqual = level;
                 level++;
-                if(lp->commandDefs.contains(commandStack.top().optionalCommandName + "/" + keyName)){
+                if(!commandStack.isEmpty() && lp->commandDefs.contains(commandStack.top().optionalCommandName + "/" + keyName)){
                     // handle keyval values with normal commandStack mechanism (mandatory argument only!!)
                     // allows argument classification
                     CommandDescription cd = lp->commandDefs.value(commandStack.top().optionalCommandName + "/" + keyName);