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RepsGRepsG 

AddEventListener issue

hi When I switch on IE10 Debugger, I recieve the following error message>
Is this something to be concerned about? and what would I need to do to further debug this?

The error seems to be from script https://cs20.salesforce.com/jslibrary/1420677020000/sfdc/main.js
SCRIPT5007: Unable to get property 'addEventListener' of undefined or null reference
main.js, line 18 character 88
PratikPratik (Salesforce Developers) 
Hi,

Are you getting this error for VF page in which javascript is used, You can refer to these post:
http://stackoverflow.com/questions/11095319/how-to-fix-document-mode-restart-in-ie-9
http://stackoverflow.com/questions/10457111/why-html1113-document-mode-restart-from-ie9-standards-to-quirks

Thanks,
Pratik