From f84762d84a1b3d1b7571757154e15c6a20873663 Mon Sep 17 00:00:00 2001
From: Marshall Greenblatt <magreenblatt@gmail.com>
Date: Tue, 20 Apr 2021 12:16:33 -0400
Subject: [PATCH] Fix crash closing DevTools window (fixes issue #3111)

---
 libcef/browser/devtools/devtools_frontend.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libcef/browser/devtools/devtools_frontend.cc b/libcef/browser/devtools/devtools_frontend.cc
index 18bdf59cf..f495a33f4 100644
--- a/libcef/browser/devtools/devtools_frontend.cc
+++ b/libcef/browser/devtools/devtools_frontend.cc
@@ -533,6 +533,9 @@ void CefDevToolsFrontend::HandleMessageFromDevToolsFrontend(
 void CefDevToolsFrontend::DispatchProtocolMessage(
     content::DevToolsAgentHost* agent_host,
     base::span<const uint8_t> message) {
+  if (frontend_browser_->GetWebContents()->IsBeingDestroyed())
+    return;
+
   base::StringPiece str_message(reinterpret_cast<const char*>(message.data()),
                                 message.size());
   if (ProtocolLoggingEnabled()) {