From c8693e1e894a758e2c686bdbc5ccaf2005fdf8a9 Mon Sep 17 00:00:00 2001
From: Alibek Omarov <a1ba.omarov@gmail.com>
Date: Sun, 5 Apr 2026 05:44:18 +0500
Subject: [PATCH] engine: common: fix char array underflow, on Q_strlen() - 1

---
 engine/common/con_utils.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/engine/common/con_utils.c b/engine/common/con_utils.c
index 5fdef596..11fe6e09 100644
--- a/engine/common/con_utils.c
+++ b/engine/common/con_utils.c
@@ -1199,6 +1199,9 @@ void Con_CompleteCommand( field_t *field, qboolean print_suggestions )
 	// setup the completion field
 	con.completionField = field;
 
+	if( COM_StringEmpty( con.completionField->buffer ))
+		return;
+
 	// only look at the first token for completion purposes
 	Cmd_TokenizeString( con.completionField->buffer );