Context

No response

Bug description

Social plugin is not working when using environment variables in plugins.social.cards

Related links

• Bug reporting
• https://squidfunk.github.io/mkdocs-material/setup/setting-up-social-cards/#built-in-social-plugin said that you should set environment variable if you want to switch plugin off for local builds

Reproduction

example.zip

Steps to reproduce

set plugins.social.cards to !ENV [CARDS, false], just like what document says, then an Exception is encountered:

AttributeError: 'SocialPlugin' object has no attribute '_image_promises'

An minimum mkdocs.yml should be this:

site_name: Test site

theme:
  name: material

plugins:
  - social:
      cards: !ENV [CARDS, false]
  - search

Browser

Chrome, Safari, Edge, Firefox, Opera

Before submitting

• I have read and followed the bug reporting guidelines.
• I have attached links to the documentation, and possibly related issues or discussions.
• I assure that I have removed all customizations before submitting this bug report.
• I have attached a minimal reproduction.