You change author slugs with WP Author Slug. Nice URLs. But author pages show 404 error. Not found. That is frustrating because author archives are broken.
A common issue is that WordPress does not flush rewrite rules after slug change. The plugin changes slugs in database. But WordPress routing still looks for old slugs. The plugin is not broken. Rewrite rules need refresh.
Why WP Author Slug Creates 404 Errors
WP Author Slug updates user_nicename field in database. This changes author slug. But WordPress caches rewrite rules. Old slug still in cache. When you visit new author URL, WordPress does not recognize it. 404 error appears.
This is not WP Author Slug being bad. Rewrite rules must be flushed.
The Most Common Author Page 404 Causes
- Rewrite rules not flushed after slug change
- Author has no published posts (archive page not created)
- Cache plugin serving old redirects
- Permalink structure changed after slug change
- Plugin conflict with author URL rewrite
Flushing rewrite rules fixes most cases.
How to Fix Author Page 404 Errors
- Go to Settings → Permalinks
- Click “Save Changes” without changing anything
- This flushes rewrite rules
- Clear all cache (plugin, browser, CDN)
- Test author page URL
- If still 404, go to WP Author Slug → Settings → Flush Rules
- Click “Force Flush Rewrite Rules”
Saving permalinks is usually enough.
How to Prevent Author Page 404 in the Future
After changing any author slug, always go to Settings → Permalinks → Save Changes. Make this a habit. Also, ensure author has at least one published post. Author archives do not exist without posts.
No posts = 404 even with correct slug.
Alternative: Disable WP Author Slug
If 404 errors persist, disable plugin. Author slugs revert to default (username or nicename). Your author pages will work again. Use different method for author URL customization.
Some themes have built-in author slug settings.
People Also Ask About WP Author Slug Problems
Why does my author page show 404 after changing slug?
Rewrite rules not flushed. Save permalinks settings to fix.
Should I stop using WP Author Slug?
No. Just flush rewrite rules after each slug change.
Is WP Author Slug worse than Edit Author Slug?
Edit Author Slug has same flush requirement. Both work with proper flushing.
Final Thoughts
If WP Author Slug causes 404 errors, save permalinks settings. Flush rewrite rules. Clear cache. Author pages will work with new slugs.