No route found for path: "undefined" and request method: "GET"

Hi, I’m migrating my site from Kirby 3.x to Kirby 4.1.
I get this error on the panel:

No route found for path: “undefined” and request method: “GET”

What can I check?
Thanks

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Just in case some other guys get into the same error - it was a markdown field plugin. Just remove the plugin.

I removed the plugin and made sure it’s not called in any blueprint but I’m still getting this error (on some pages only). Is there anything else I’m missing?

Ah, I found out it was caused by another plugin, namely the color palette plugin by Silvain Julé. There is already a bug report for that and someone has created a fork with a temporary fix, but long story short: Kirby 4 now has a built-in color field, making this plugin kind of obsolete anyway.