# Firefox Error: getOperatorList - ignoring errors during "GetOperatorList: page 0" task: "DataCloneError: The object could not be cloned."

**URL:** <https://pdfjs.community/t/firefox-error-getoperatorlist-ignoring-errors-during-getoperatorlist-page-0-task-datacloneerror-the-object-could-not-be-cloned/897>\
**Category:** Technical Support\
**Tags:** pdfjs-express\
**Created:** [July 23, 2021, 12:05pm UTC](https://pdfjs.community/t/firefox-error-getoperatorlist-ignoring-errors-during-getoperatorlist-page-0-task-datacloneerror-the-object-could-not-be-cloned/897 "2021-07-23T12:05:24Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![Logan](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/logan/32/13_2.png) [@Logan](https://pdfjs.community/u/Logan)\
**Post date:** [July 29, 2021, 8:10pm UTC](https://pdfjs.community/t/firefox-error-getoperatorlist-ignoring-errors-during-getoperatorlist-page-0-task-datacloneerror-the-object-could-not-be-cloned/897/7 "2021-07-29T20:10:40Z")

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Moving this conversation [here](https://pdfjs.community/t/after-updating-chrome-firefox-browser-to-latest-version-pdf-viewer-js-doesnt-show-barcodes-qrcodes/905/4).

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_[View the full topic](https://pdfjs.community/t/firefox-error-getoperatorlist-ignoring-errors-during-getoperatorlist-page-0-task-datacloneerror-the-object-could-not-be-cloned/897)._