RoboHelp authored manual generating a syntax error in IE.

I have used RoboHelp2017 to author an online user manual.
This includes videos, glossary, index, images, links and using the Search.
Our users navigate to this using Edge, Chrome, Firefox and
IE. The manual works – opens in all of them. The videos play, the
images enlarge when selected, links work.
Unfortunately, the search feature is not working in internet
explorer. I had one of our software developers look into it and there is
a Syntax error.
I am using:
Adobe RoboHelp 2017
I have reproduced the error in: IE version 11.0.9600.19129
Please advise.
Colleen
