From 05fc63932bbd866dc73758452b67f83132a7a278 Mon Sep 17 00:00:00 2001
From: Sebastian Zaha <sebastian.zaha@gmail.com>
Date: Mon, 31 Jul 2023 23:07:49 +0200
Subject: [PATCH] Ladybird: Fix JS console crash when history is empty

Do not try to navigate JS console history forward when it is empty. A
crash was occurring because of size_t underflow.
---
 Ladybird/ConsoleWidget.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Ladybird/ConsoleWidget.cpp b/Ladybird/ConsoleWidget.cpp
index ddf5e09bf3..d92d05eb0f 100644
--- a/Ladybird/ConsoleWidget.cpp
+++ b/Ladybird/ConsoleWidget.cpp
@@ -175,6 +175,8 @@ void ConsoleInputEdit::keyPressEvent(QKeyEvent* event)
 {
     switch (event->key()) {
     case Qt::Key_Down: {
+        if (m_history.is_empty())
+            break;
         auto last_index = m_history.size() - 1;
         if (m_history_index < last_index) {
             m_history_index++;