Site breaking only on product detail page.

All of a sudden after adding meta description to the item its breaks.
Meta title is already there and works but as soon as i add the meta description it breaks.

What version of nopCommerce ?
Are you using a Theme - If so switch back to DefaultClean theme and test if you still have the issue

Using version 4.5 and yes using theme. But it was working fine with me manually adding meta descriptions aswell something just happened no idea what and it started breaking

What errors in the Log ?
Try Restarting the webserver