dart2js Uncaught TypeError cannot read property

When I compile my dart2js I keep getting an error from the shadow_dom.debug.js

Uncaught TypeError: Cannot read property 'st885323213750055768' of undefined

Does anyone what this property is?

Copyright Notice：Content Author:「robbie」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/21127976/dart2js-uncaught-typeerror-cannot-read-property

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