Type: Debugger

Additional context
PLEASE NOTE This works on VSCode stable release, only crashing on insiders build

Version: 1.30.0-insider
Commit: 0d3a14402d88f0f555ab3250c3ffd4c45a251665
Date: 2018-11-22T06:14:14.378Z
Electron: 2.0.12
Chrome: 61.0.3163.100
Node.js: 8.9.3
V8: 6.1.534.41
OS: Linux x64 4.15.0-39-generic

Using type "cppdbg" failing to launch cpp program [ basic hello world, basic auto generated launch script ]

In the debugger window it prints:
Stopping due to fatal error: NullReferenceException: Object reference not set to an instance of an object

To Reproduce
launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "C++ Launch",
      "type": "cppdbg",
      "request": "launch",
      "program": "${workspaceRoot}/a.out",
      "args": [],
      "stopAtEntry": false,
      "cwd": "${workspaceRoot}",
      "environment": [],
      "externalConsole": true,
      "linux": {
          "MIMode": "gdb",
          "setupCommands": [
              {
                  "description": "Enable pretty-printing for gdb",
                  "text": "-enable-pretty-printing",
                  "ignoreFailures": true
              }
          ]
      }
  }
]
}

code
int main() { return 0; }