title: Flutter: "Lost connection to device" error after Hot Reload
body: <p>Here's the full error from the debug console:</p>
  
  <pre><code>Launching lib\main.dart on Android SDK built for x86 in debug mode...
  Built build\app\outputs\apk\debug\app-debug.apk.
  I/FlutterActivityDelegate( 4158): onResume setting current activity to this
  D/        ( 4158): HostConnection::get() New Host Connection established 0xdc74b680, tid 4178
  D/EGL_emulation( 4158): eglMakeCurrent: 0xdc741300: ver 2 0 (tinfo 0xdc74c480)
  F/libc    ( 4158): Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0xd in tid 4177 (Thread-2), pid 4158 (le.startupnamer)
  *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
  Build fingerprint: 'google/sdk_gphone_x86/generic_x86:9/PPP4.180612.007/4860066:userdebug/dev-keys'
  Revision: '0'
  ABI: 'x86'
  pid: 4158, tid: 4177, name: Thread-2  &gt;&gt;&gt; com.example.startupnamer &lt;&lt;&lt;
  signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0xd
  Cause: null pointer dereference
  eax ca0a8aac  ebx ca0a8aac  ecx 0000000a  edx c9046c80
  edi de6638d0  esi c90479f8
  ebp c9046b58  esp c9046b58  eip c96e31d8
  backtrace:
  #00 pc 006981d8  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #01 pc 008f5b75  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #02 pc 008e87ea  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #03 pc 008f3ad6  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #04 pc 008e8b2f  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #05 pc 008ffb03  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #06 pc 008eb310  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #07 pc 008f3d98  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #08 pc 008e8b2f  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #09 pc 008eafc8  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #10 pc 008f997f  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #11 pc 008eaff8  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #12 pc 008fc81c  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #13 pc 008eaf69  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #14 pc 008f997f  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #15 pc 008eaff8  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #16 pc 008ef41e  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #17 pc 008f0570  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #18 pc 0091433e  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #19 pc 0092fad4  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #20 pc 00932f2a  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #21 pc 00934573  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #22 pc 00933d2b  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #23 pc 0093004a  /data/app/com.example.startupnamer-Doz3k_Pl0QfJtnmxYqiyHg==/lib/x86/libflutter.so
  #24 pc 0000056b  &lt;anonymous:c7680000&gt;
  Lost connection to device.
  Exited (sigterm)
  </code></pre>
  
  <p>I'm using Visual Studio Code with the Flutter extension, but without the Dart extension. I'm also trying to run my Flutter app on an Android emulator, which is a Nexus 6 with API 28 x86. Emulated performance is set to "Hardware - GLES 2.0". The rest of the settings are left as default.</p>
  
  <p>I Cold Boot the emulator before using it with Flutter, due to adb connection problems that prevent the emulator from loading if I start the emulator normally. Possibly not related, but good to note anyway.</p>
  
  <p>Typing <code>flutter doctor -v</code> into the command line will show the following:</p>
  
  <pre><code>[√] Flutter (Channel beta, v0.5.1, on Microsoft Windows [Version 10.0.17134.112], locale en-AU)
      • Flutter version 0.5.1 at C:\dev\flutter
      • Framework revision c7ea3ca377 (6 weeks ago), 2018-05-29 21:07:33 +0200
      • Engine revision 1ed25ca7b7
      • Dart version 2.0.0-dev.58.0.flutter-f981f09760
  
  [√] Android toolchain - develop for Android devices (Android SDK 28.0.1)
      • Android SDK at C:\Android\android-sdk
      • Android NDK location not configured (optional; useful for native profiling support)
      • Platform android-28, build-tools 28.0.1
      • ANDROID_HOME = C:\Android\android-sdk
      • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
      • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)
      • All Android licenses accepted.
  
  [√] Android Studio (version 3.1)
      • Android Studio at C:\Program Files\Android\Android Studio
      • Flutter plugin version 26.0.1
      • Dart plugin version 173.4700
      • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)
  
  [√] IntelliJ IDEA Community Edition (version 2018.1)
      • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2018.1.2
      • Flutter plugin version 26.0.2
      • Dart plugin version 181.4668.60
  
  [!] VS Code, 64-bit edition (version 1.25.0)
      • VS Code at C:\Program Files\Microsoft VS Code
      • Flutter extension not installed; install from
        https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
  
  [!] Connected devices
      ! No devices available
  
  ! Doctor found issues in 2 categories.
  </code></pre>
  
  <p><strong>Now for the actual problem:</strong></p>
  
  <p>When I load my Flutter app, no matter what kind of state the code is in, the app launches from the state it was in when I saved it for the first time after creation. If I try to make any change to the code (I simply change the theme color) and try to Hot Reload, the app crashes with the error I posted above. Why does this happen, and what can I do to fix this?</p>
  
  <p>There is no error when I load the project, or when I Hot Reload without making any change to the code.</p>
  
  <p>Any help is appreciated.</p>
  
  <p>EDIT: I'm unable to replicate this bug in Android Studio using the same project. This bug only appears in Visual Studio Code for me.</p>