Search plugin crashes on numeric page titles in nav

[planetf1]

Context

We noticed our github actions which use mkdocs-material failing yesterday, co-inciding with the update of mkdocs-material to 9.0.0 (we do a pip install within our workflow)

Bug description

mkdocs build is failing with errors such as

ERROR    -  Error building page 'release-notes/1-0.md': can only join an iterable
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.11.1/x64/bin/mkdocs", line 8, in <module>
    sys.exit(cli())
             ^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^

Link above has the full error

Related links

• Example action : https://github.com/odpi/egeria-docs/actions/runs/3823032364
• workflow : https://github.com/odpi/egeria-docs/blob/main/.github/workflows/pr-mkdocs.yml

Reproduction

example.zip

Steps to reproduce

mkdocs serve

Browser

No response

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• 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.

[planetf1]

The specific cause here seems to be our use of filenames like '1-0.md' where this is also referenced in mkdocs.yml
In 8.5.3 this worked, in 9.0.1 this fails

[planetf1]

Ref: original discussion: #4816

[squidfunk]

Thanks for reporting! I'll look into it.

[squidfunk]

Fixed in 4548afb. Thanks for the excellent reproduction which made fixing this error a breeze. The error was caused because of the use of a float in mkdocs.yml as a title for a page:

nav:
  ...
  - 1.0: release-notes/1-0.md

This was not handled by the search plugin before. To mitigate the issue before the next release (we just pushed out 9.0.1 and want to collect some more bug fixes before 9.0.2), put 1.0 in quotes: "1.0" or install from git.

[planetf1]

Brilliant. Thanks for super quick fix and glad we could help improve! Mkdocs material is great!

[squidfunk]

Released as part of 9.0.2.