Call to a member funtion toRfc822String() on null

[Cabbidachi]

Bug description

Hello,

i have installed this addon in order to get my blog onto a RSS feed. What is weird that at first this addon worked just fine and then suddendly it just stopped working? I recreated the config file to see if starts working again after that but no success. Everytime i now try to access my feed i get this error:

Steps to reproduce

i installed the addon via composer
then i published the config file as told
at first stuff worked but then out of nowhere it stopped working and now always shows that error.
Even after i deleted my own config and republished the default config it still occurs.

Environment and versions

Environment
Application Name: LunarEngine
Laravel Version: 9.50.0
PHP Version: 8.2.12
Composer Version: 2.5.5
Environment: local
Debug Mode: ENABLED
URL: localhost
Maintenance Mode: OFF

Cache
Config: NOT CACHED
Events: NOT CACHED
Routes: NOT CACHED
Views: CACHED

Drivers
Broadcasting: log
Cache: statamic
Database: mysql
Logs: stack / single
Mail: smtp
Queue: sync
Session: file

Statamic
Addons: 1
Antlers: runtime
Stache Watcher: Enabled
Static Caching: Disabled
Version: 4.32.0 Solo

Statamic Addons
mitydigital/feedamic: 2.2.9

Additional details

No response

[martyf]

Can you provide more details, including the yaml for:

• collection config
• blueprint for the collections being included in your feed

[Cabbidachi]

@martyf
YAML for the collection config "blog":

title: Blog
template: blogpost
layout: layout
revisions: false
route: '/blog/{{ slug }}'
sort_dir: asc
date_behavior:
  past: public
  future: private
preview_targets:
  -
    label: Entry
    url: '{permalink}'
    refresh: true

YAML for Blueprint

tabs:
  main:
    display: Main
    sections:
      -
        fields:
          -
            handle: title
            field:
              type: text
              required: true
              validate:
                - required
          -
            handle: blog_date
            field:
              mode: single
              inline: false
              full_width: false
              columns: 1
              rows: 1
              time_enabled: false
              time_seconds_enabled: false
              type: date
              display: 'Blog Date'
              icon: date
              listable: hidden
              instructions_position: above
              visibility: visible
              replicator_preview: true
              hide_display: false
          -
            handle: blog_title
            field:
              input_type: text
              antlers: false
              type: text
              display: 'Blog Title'
              icon: text
              listable: hidden
              instructions_position: above
              visibility: visible
              replicator_preview: true
              hide_display: false
          -
            handle: blog_image
            field:
              max_files: 1
              mode: list
              container: assets
              restrict: false
              allow_uploads: true
              show_filename: true
              show_set_alt: true
              type: assets
              display: 'Blog Image'
              icon: assets
              listable: hidden
              instructions_position: above
              visibility: visible
              replicator_preview: true
              hide_display: false
          -
            handle: blog_content
            field:
              restrict: false
              buttons:
                - bold
                - italic
                - unorderedlist
                - orderedlist
                - quote
                - link
                - image
                - table
              automatic_line_breaks: true
              automatic_links: false
              escape_markup: false
              heading_anchors: false
              smartypants: false
              table_of_contents: false
              antlers: false
              type: markdown
              display: 'Blog Content'
              icon: markdown
              listable: hidden
              instructions_position: above
              visibility: visible
              replicator_preview: true
              hide_display: false
  sidebar:
    display: Sidebar
    sections:
      -
        fields:
          -
            handle: slug
            field:
              type: slug
              localizable: true
          -
            import: seo
title: Blog

[martyf]

When using a Blog (or dated collection like this), there's two things to do:

Firstly, in your Collection configuration, enable "enable publish dates". This will add the following to your blog yaml:

date: true

When you do this, it will add a date field to your blueprint - just use that - so you will need to remove your blog_date field - just make sure you update the date to be the blog_date values you already have.

This should resolve the issue you're seeing, as that error is occurring when Statamic is trying to get the publish date which relies on the date field being in your blueprint.

[Cabbidachi]

@martyf omg i didn't know.
i thought i had to add it manually. that explains why it suddendly stopped working.
it was because i added the blog_date thing. Tested your solution and can confirm that it now works again.
thank you very much. :)
i am also gonna directly close this as the issue is resolved.