Core error (filename too long)

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Syncing new files from LR to WP does not work anymore. No errors in log, but fail in lightroom: “no response from server.”

When I open de WPLR admin page in I get the following error in the logs:

[core:error] (pid xxx) (36)File name too long: AH00127: Cannot map GET /wp-admin/image/png;base64,<data>, to file, referer: https://xx/admin.php?meowapps-main-menu

Any idea? 😉