EPG missing via openwebif

[Morini]

Apologies for the number of problem posts from me recently. My new setup is *almost* there now, just one more little issue I have run into.

The EPG is appearing fine (complete) when I access "guide" on the receiver, it also appears fine when browsing to the openwebif url and selecting EPG in the menu on the left hand side. However, I noticed that the remote kodi client(s) are all missing large chunks of EPG data. There are a lot of these messages in the kodi log file

2024-04-18 10:46:05.628 T:10940   error <general>: AddOnLog: pvr.vuplus: pvr.vuplus - GetHttp - Could not open webAPI.
2024-04-18 10:46:05.628 T:10940   error <general>: AddOnLog: pvr.vuplus: pvr.vuplus - GetEPGForChannel Unable to parse XML: Error document empty. at line 0
2024-04-18 10:46:05.628 T:10940   error <general>: GetEPGForChannel: Add-on 1822431298 returned an error: server error
2024-04-18 10:46:05.741 T:10940   error <general>: CCurlFile::CReadState::XFILE::CCurlFile::CReadState::FillBuffer - (0x26001df5ce0) Failed: HTTP returned code 500
2024-04-18 10:46:05.742 T:10940   error <general>: CCurlFile::XFILE::CCurlFile::Open - <https://<redacted>:443/web/epgservice?sRef=1%3A0%3A19%3A50FA%3A80F%3A2%3A11A0000%3A0%3A0%3A0%3A> Failed with code 500:

Pasting the url into a browser gave me this

Screenshot 2024-04-18 113628.jpg

Which suggests to me the issue probably isn't on the client side. Any pointers on what I can do to fix this one?

[edit]
I see the image is not very readable, not sure how to make it bigger?