'Cannot read property 'toString' of null.' when starting debugger for second+ time

[richardfuca]

Issue Type

Bug

Description

Steps to Reproduce:

1. Have project open, with "console" in debugger launch configuration set to "integratedTerminal"

2. Start debugging the program (F5), then quit the application (ex. by using Ctrl-C). Keep the Node Debug Console open.

3. Try debugging the program again (F5)

OR

2. Start debugging the program (F5), then click on the Restart button

Expected:
Debugger and program should load like it does in step 2

Actual:
This error occurs:

TypeError: Cannot read property 'toString' of null
at Function.e.isBusy (terminalSupport.ts:56)
at Function.e.runInTerminal (terminalSupport.ts:38)
at _.dispatchRequest (rawDebugSession.ts:393)
at _.e.dispatch (v8Protocol.ts:148)
at _.e.handleData (v8Protocol.ts:104)
at Socket. (v8Protocol.ts:41)
at emitOne (events.js:96)
at Socket.emit (events.js:191)
at readableAddChunk (_stream_readable.js:178)
at Socket.Readable.push (_stream_readable.js:136)

VS Code Info

VS Code version: Code 1.20.0 (c63189d, 2018-02-07T17:09:39.780Z)
OS version: Windows_NT x64 6.1.7601

System Info

Item	Value
CPUs	AMD Phenom(tm) II X6 1090T Processor (6 x 3199)
Memory (System)	16.00GB (10.01GB free)
Process Argv	C:\Program Files\Microsoft VS Code\Code.exe
Screen Reader	no
VM	0%

Reproduces without extensions

[weinand]

I cannot reproduce this problem.
Did you configure the integrated terminal in any way, e.g. by setting a special shell via the "terminal.integrated.shell.windows" setting?