Uncaught TypeError: Cannot read property 'classList' of null

[leorodriguez71]

[Enter steps to reproduce:]

1. ...
2. ...

Atom: 1.27.1 x64
Electron: 1.7.15
OS: Mac OS X 10.13.4
Thrown From: polybug package 0.2.0

Stack Trace

Uncaught TypeError: Cannot read property 'classList' of null

At /Users/mac/.atom/packages/polybug/lib/breakpoints.js:160

TypeError: Cannot read property 'classList' of null
    at /packages/polybug/lib/breakpoints.js:160:22)
    at emitTwo (events.js:111:20)
    at PythonDebugger.emit (events.js:194:7)
    at /packages/polybug/lib/python.js:42:18)
    at emitOne (events.js:101:20)
    at Socket.emit (events.js:191:7)
    at readableAddChunk (_stream_readable.js:178:18)
    at Socket.Readable.push (_stream_readable.js:136:10)
    at Pipe.onread (net.js:560:20)

Commands

  2x -3:30.8.0 core:move-down (input.hidden-input)
  4x -3:29.8.0 core:move-right (input.hidden-input)
     -3:27.8.0 editor:newline (input.hidden-input)
  3x -3:27 core:move-down (input.hidden-input)
  2x -3:26.1.0 core:move-up (input.hidden-input)
  2x -3:25.3.0 core:move-down (input.hidden-input)
  2x -3:23.1.0 core:save (input.hidden-input)
     -0:56.9.0 find-and-replace:show (input.hidden-input)
     -0:55.5.0 editor:consolidate-selections (input.hidden-input)
     -0:55.5.0 core:cancel (input.hidden-input)
 17x -0:51 core:move-up (input.hidden-input)
  3x -0:43 editor:newline (input.hidden-input)
     -0:40.8.0 core:save (input.hidden-input)
     -0:35.4.0 core:undo (input.hidden-input)
     -0:33.3.0 core:save (input.hidden-input)
     -0:16.3.0 polybug:debug-file (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-one-dark-syntax.theme-one-dark-ui.teletype-Authenticated)

Non-Core Packages

atom-python-run 0.9.6 
busy-signal 1.4.3 
Hydrogen 2.5.0 
intentions 1.1.5 
linter 2.2.0 
linter-gcc 0.7.1 
linter-pylama 0.9.5 
linter-python 3.1.2 
linter-ui-default 1.7.1 
polybug 0.2.0 
python-tools 0.6.9 
teletype 0.13.2