Issue Type: Bug

1.Install extension actboy168.lua-debug
2.New file test.lua
3.Type print 'hello'
4.F5

Everything will be OK after reload.

VS Code version: Code 1.31.1 (1b8e830, 2019-02-12T02:20:54.427Z)
OS version: Windows_NT x64 10.0.17763