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Polymer 2.3.1: Uncaught TypeError: Cannot read property 'parentNode' of undefined #4986

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simonfuhrmann opened this issue Dec 12, 2017 · 1 comment
Closed
1 of 6 tasks

Polymer 2.3.1: Uncaught TypeError: Cannot read property 'parentNode' of undefined #4986

simonfuhrmann opened this issue Dec 12, 2017 · 1 comment
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@dfreedm
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2.x bug p0

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@simonfuhrmann
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simonfuhrmann commented Dec 12, 2017 •
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With Polymer 2.3.1, I get the following error message. Downgrading to Polymer 2.3.0 resolves the issue.

Uncaught TypeError: Cannot read property 'parentNode' of undefined
    at processElementStyles (element-mixin.html:431)
    at Function._finalizeTemplate (element-mixin.html:650)
    at HTMLElement._initializeProperties (element-mixin.html:591)
    at HTMLElement._initializeProperties (legacy-element-mixin.html:163)
    at new PropertyAccessors (property-accessors.html:147)
    at new TemplateStamp (template-stamp.html:121)
    at new PropertyEffects (property-effects.html:1134)
    at new PolymerElement (element-mixin.html:559)
    at new GestureEventListeners (gesture-event-listeners.html:46)
    at new Dir (dir-mixin.html:130)

Description

After updating my project to Polymer 2.3.1, the project stopped working with the above error message. In the mentioned location element-mixin.html:431, the variable templateStyle is undefined, because templateStyles is an empty node list.

Expected Results

No JS error.

Actual Results

JS error.

Browsers Affected

  • Chrome
  • Firefox
  • Edge
  • Safari 9
  • Safari 8
  • IE 11

Versions

  • Polymer: v2.3.1
  • webcomponents: v1.0.20
@dfreedm dfreedm added p0 and removed p1 labels Dec 12, 2017
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dfreedm commented Dec 12, 2017

Looks like this can only happen if you use <link rel="import" type="css"> without having a style in the template

dfreedm added a commit that referenced this issue Dec 12, 2017
@dfreedm
Fix regression with imported css
706e602 
Fix case where `<link rel="import" type="css">` is the only styling for
an element

Fixes #4986
@dfreedm dfreedm mentioned this issue Dec 12, 2017
Merged
fanthos added a commit to fanthos/home-assistant-polymer that referenced this issue Dec 13, 2017
@fanthos
Workaround for Polymer/polymer#4986
c6611d1 
Fix bower.json version string
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@dfreedm @simonfuhrmann @TimvdLippe