System 800xA script error opening a web page using web page aspect

Hi I wonder if someone could help,

I am experiencing a script error "Expected identifier, string or number" when using a web page aspect in 800xA FP4 Rev E to open a web page hosted in a metering device.

If I open the page using IE 11 directly there are no errors, also if I use the windows application aspect in 800xA with argument to open the page I also do not experiece the error.

The error can be ignored by acceping the dialogue and continuing to run the script but I would like to find out if there is a way to ignore this check so the customer does not see this error

I have tried to disable script errors in IE 11 settings but this has no effect

Many Thanks

John