From 4f12e13a7ee80272c6202d7fbef6486fd8861ac8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=86=89=E5=9D=A4?= <rankun@bytedance.com>
Date: Sat, 11 Jun 2022 22:31:19 +0800
Subject: [PATCH] fix: crash on repeat disconnect

---
 QtScrcpy/ui/dialog.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/QtScrcpy/ui/dialog.cpp b/QtScrcpy/ui/dialog.cpp
index 1683cf6..5edfb08 100644
--- a/QtScrcpy/ui/dialog.cpp
+++ b/QtScrcpy/ui/dialog.cpp
@@ -464,8 +464,11 @@ void Dialog::onDeviceConnected(bool success, const QString &serial, const QStrin
 void Dialog::onDeviceDisconnected(QString serial)
 {
     GroupController::instance().removeDevice(serial);
-
-    auto data = qsc::IDeviceManage::getInstance().getDevice(serial)->getUserData();
+    auto device = qsc::IDeviceManage::getInstance().getDevice(serial);
+    if (!device) {
+        return;
+    }
+    auto data = device->getUserData();
     if (data) {
         VideoForm* vf = static_cast<VideoForm*>(data);
         qsc::IDeviceManage::getInstance().getDevice(serial)->deRegisterDeviceObserver(vf);