Hi Tuong,
Thank you for your interest in Syncfusion products.
We are able to reproduce the mentioned exception issue in word to HTML
conversion. Could you please report this issue through Direct Trac Developer
Support System (https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents),
because you can take the advantage of the expertise of a dedicated support
engineer and a guaranteed response time and we hope you will take advantage of
this system as well. If you have already reported, please ignore this.
Regards,
Mutheeswaran