ember-power-select is causing error after upgrading from 1.5.7 to 2.0.1

[yads]

We're using the ember-power-select plugin and after upgrading to ember-cli-less 2.0.1 we're getting the following LessCompiler error:

SyntaxError: Cannot read property 'eval' of null in /var/folders/kb/cy0txbmx1g579kycjsyfl5q89dlr3b/T/broccoli-674726wFPAksadaZw/out-335-broccoli_merge_trees_full_application/app/styles/ember-power-select/variables.less on line 19, column 1:
18 @ember-power-select-border-color: #aaaaaa;
19 @ember-power-select-focus-border-color: @ember-power-select-border-color;
20 @ember-power-select-default-border: 1px solid @ember-power-select-border-color;

Syntax (LessCompiler)

Cannot read property 'eval' of null

Stack Trace and Error Report: /var/folders/kb/cy0txbmx1g579kycjsyfl5q89dlr3b/T/error.dump.f49937ceb098cb440848bb3d55b7d998.log

here's the error snippet from the error dump referenced above

ERROR Summary:

• broccoliBuilderErrorStack: TypeError: Cannot read property 'eval' of null
  at Array. (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/variable.js:39:31)
  at Node.Variable.find (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/variable.js:55:17)
  at Node.Variable.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/variable.js:27:21)
  at Node.Expression.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/expression.js:39:37)
  at Node.Value.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/value.js:23:30)
  at Node.Declaration.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/declaration.js:62:33)
  at Node.Ruleset.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/ruleset.js:181:50)
  at module.exports (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/transform-tree.js:76:22)
  at ParseTree.toCSS (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/parse-tree.js:14:25)
  at /Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/render.js:35:40
• codeFrame: Cannot read property 'eval' of null
• errorMessage: Cannot read property 'eval' of null
  at LessCompiler
  -- created here: --
  at LessCompiler.Plugin (/Users/vkazakov/dev/Mothership/frontend/node_modules/broccoli-caching-writer/node_modules/broccoli-plugin/index.js:10:31)
  at LessCompiler.CachingWriter [as constructor] (/Users/vkazakov/dev/Mothership/frontend/node_modules/broccoli-caching-writer/index.js:18:10)
  at new LessCompiler (/Users/vkazakov/dev/Mothership/frontend/node_modules/broccoli-less-single/index.js:19:17)
  at /Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-less/index.js:30:12
  at Array.map (native)
  at LESSPlugin.toTree (/Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-less/index.js:26:34)
  at /Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-preprocess-registry/preprocessors.js:180:26
  at Array.forEach (native)
  at processPlugins (/Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-preprocess-registry/preprocessors.js:178:11)
  at module.exports.preprocessCss (/Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-preprocess-registry/preprocessors.js:148:10)
  -- (end) --
• errorType: Syntax
• location:
  • column: 0
  • file: [undefined]
  • line: 19
  • treeDir: [undefined]
• message: Cannot read property 'eval' of null
  at LessCompiler
  -- created here: --
  at LessCompiler.Plugin (/Users/vkazakov/dev/Mothership/frontend/node_modules/broccoli-caching-writer/node_modules/broccoli-plugin/index.js:10:31)
  at LessCompiler.CachingWriter [as constructor] (/Users/vkazakov/dev/Mothership/frontend/node_modules/broccoli-caching-writer/index.js:18:10)
  at new LessCompiler (/Users/vkazakov/dev/Mothership/frontend/node_modules/broccoli-less-single/index.js:19:17)
  at /Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-less/index.js:30:12
  at Array.map (native)
  at LESSPlugin.toTree (/Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-less/index.js:26:34)
  at /Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-preprocess-registry/preprocessors.js:180:26
  at Array.forEach (native)
  at processPlugins (/Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-preprocess-registry/preprocessors.js:178:11)
  at module.exports.preprocessCss (/Users/vkazakov/dev/Mothership/frontend/node_modules/ember-cli-preprocess-registry/preprocessors.js:148:10)
  -- (end) --
• name: BuildError
• nodeAnnotation: [undefined]
• nodeName: LessCompiler
• originalErrorMessage: Cannot read property 'eval' of null
• stack: TypeError: Cannot read property 'eval' of null
  at Array. (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/variable.js:39:31)
  at Node.Variable.find (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/variable.js:55:17)
  at Node.Variable.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/variable.js:27:21)
  at Node.Expression.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/expression.js:39:37)
  at Node.Value.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/value.js:23:30)
  at Node.Declaration.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/declaration.js:62:33)
  at Node.Ruleset.eval (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/tree/ruleset.js:181:50)
  at module.exports (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/transform-tree.js:76:22)
  at ParseTree.toCSS (/Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/parse-tree.js:14:25)
  at /Users/vkazakov/dev/Mothership/frontend/node_modules/less/lib/less/render.js:35:40

[knownasilya]

@jasonmit any thoughts on this?

[jasonmit]

@knownasilya haven't had a chance to look. Issue is rather old, is the problem still happening with latest of less and power-select?

[knownasilya]

#69 also seems 2.0 specific