Duplicate URL (Permalinks) with /undefined slug

Hello,

The issue as written in the title is present in absolutely every of my product pages.
Their is no problems to charge the pages, but between 1 and 2.5 seconds are lost because of a very strange request : […].com/page-product/undefined

Each time, it ends with a 404 error. With an enormous lose of speed. SEO is impacted too for sure.

Do you know guys what to do to fix that ?
The slug /undefined has really nothing to do here.

• This topic was modified 4 years, 9 months ago by qlm95.