Uncaught TypeError: Cannot read property 'isUnloading' of undefined

[mehcode]

[Enter steps to reproduce below:]

Switch to another project or close the current project with any open buffers (tabs).

Atom Version: 1.7.0-dev-bf5dea0
System: linux 4.4.3-1-ARCH
Thrown From: project-plus package, v0.7.2

Stack Trace

Uncaught TypeError: Cannot read property 'isUnloading' of undefined

At /usr/local/share/atom/resources/app.asar/src/project.js:135

TypeError: Cannot read property 'isUnloading' of undefined
    at /usr/local/share/atom/resources/app.asar/src/project.js:135:36
    at Array.map (native)
    at Project.module.exports.Project.serialize (/usr/local/share/atom/resources/app.asar/src/project.js:132:41)
    at AtomEnvironment.module.exports.AtomEnvironment.serialize (/usr/local/share/atom/resources/app.asar/src/atom-environment.js:766:31)
    at atomSerialize (/home/ryan/Workspace/project-plus/lib/util.coffee:188:15)
    at saveCurrentState (/home/ryan/Workspace/project-plus/lib/util.coffee:15:18)
    at Object.exports.closeProject (/home/ryan/Workspace/project-plus/lib/util.coffee:280:3)
    at atom-workspace.subscriptions.add.atom.commands.add.project-plus:close (/home/ryan/.atom/packages/project-plus/lib/project-plus.coffee:41:14)
    at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (/usr/local/share/atom/resources/app.asar/src/command-registry.js:260:29)
    at /usr/local/share/atom/resources/app.asar/src/command-registry.js:3:61
    at CommandPaletteView.module.exports.CommandPaletteView.confirmed (/usr/local/share/atom/resources/app.asar/node_modules/command-palette/lib/command-palette-view.js:183:32)
    at CommandPaletteView.module.exports.SelectListView.confirmSelection (/usr/local/share/atom/resources/app.asar/node_modules/atom-space-pen-views/lib/select-list-view.js:338:21)
    at space-pen-div.atom.commands.add.core:confirm (/usr/local/share/atom/resources/app.asar/node_modules/atom-space-pen-views/lib/select-list-view.js:109:19)
    at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (/usr/local/share/atom/resources/app.asar/src/command-registry.js:260:29)
    at /usr/local/share/atom/resources/app.asar/src/command-registry.js:3:61
    at KeymapManager.module.exports.KeymapManager.dispatchCommandEvent (/usr/local/share/atom/resources/app.asar/node_modules/atom-keymap/lib/keymap-manager.js:570:16)
    at KeymapManager.module.exports.KeymapManager.handleKeyboardEvent (/usr/local/share/atom/resources/app.asar/node_modules/atom-keymap/lib/keymap-manager.js:378:22)
    at WindowEventHandler.module.exports.WindowEventHandler.handleDocumentKeyEvent (/usr/local/share/atom/resources/app.asar/src/window-event-handler.js:98:36)
    at HTMLDocument.<anonymous> (/usr/local/share/atom/resources/app.asar/src/window-event-handler.js:3:61)

Commands

     -0:11.2.0 core:confirm (atom-text-editor.editor.mini.is-focused)
     -0:10.3.0 project-plus:toggle-project-finder (atom-workspace.workspace.scrollbars-visible-always.seti-ui-no-icons.theme-one-dark-vivid-syntax.theme-one-dark-ui)
     -0:09.7.0 core:confirm (atom-text-editor.editor.mini.is-focused)
  3x -0:09.4.0 core:close (atom-workspace.workspace.scrollbars-visible-always.seti-ui-no-icons.theme-one-dark-vivid-syntax.theme-one-dark-ui)
     -0:08.1.0 project-plus:toggle-project-finder (atom-workspace.workspace.scrollbars-visible-always.seti-ui-no-icons.theme-one-dark-vivid-syntax.theme-one-dark-ui)
     -0:07.9.0 core:confirm (atom-text-editor.editor.mini.is-focused)
     -0:04.3.0 project-plus:toggle-project-finder (atom-text-editor.editor.is-focused)
     -0:04.3.0 advanced-open-file:toggle (atom-text-editor.editor.mini.is-focused)
     -0:04.0 core:confirm (atom-text-editor.path-input.editor.mini.is-focused)
     -0:03.3.0 editor:consolidate-selections (atom-text-editor.path-input.editor.mini.is-focused)
     -0:03.3.0 core:cancel (atom-text-editor.path-input.editor.mini.is-focused)
     -0:03.0 project-plus:toggle-project-finder (atom-text-editor.editor.is-focused)
     -0:02.8.0 core:confirm (atom-text-editor.editor.mini.is-focused)
     -0:01.3.0 command-palette:toggle (atom-workspace.workspace.scrollbars-visible-always.seti-ui-no-icons.theme-one-dark-vivid-syntax.theme-one-dark-ui)
     -0:00.4.0 core:confirm (atom-text-editor.editor.mini.is-focused)
     -0:00.4.0 project-plus:close (atom-workspace.workspace.scrollbars-visible-always.seti-ui-no-icons.theme-one-dark-vivid-syntax.theme-one-dark-ui)

Config

{
  "core": {
    "audioBeep": false,
    "autoHideMenuBar": true,
    "disabledPackages": [
      "styleguide"
    ],
    "themes": [
      "one-dark-ui",
      "one-dark-vivid-syntax"
    ]
  }
}

Installed Packages

# User
Stylus, v3.0.0
advanced-open-file, v0.14.3
atom-import-sort, v0.6.0
file-icons, v1.6.18
language-babel, v2.15.5
linter, v1.11.3
linter-stylint, v2.1.2
minimap, v4.20.0
one-dark-vivid-syntax, v1.1.2
pigments, v0.24.4
project-plus, v0.7.2
remember-file-positions, v0.2.2

# Dev
No dev packages