Greasy Fork

When I clicked the "Recheck now" button in my script's Derivatives tab, the page jumped to a new page but failed with HTTP ERROR 500.

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No only in one script, but all the script have this problem.

This should be fixed now, thanks for reporting.

THX, the page showed a notice Similarity check will be completed in a few minutes., and it worked!

I see dozens of "Very similar" scripts, but all of them have nothing in common: https://greasyfork.org/en/scripts/407284-imdb-scout-mod/derivatives
When previous old version not even listed https://greasyfork.org/en/scripts/3967-imdb-scout

https://greasyfork.org/en/scripts/407284-imdb-scout-mod has an error: on line 9334, there's a return outside of a function. Greasy Fork is choking on that when trying to parse your script, concluding your script is an empty string, and the result is you're matching with other scripts that have a similar error.

I'll see if I can fix the comparison issue, but you should fix your script too.

I read that it's an "error" in javasript, but for some reason it works in userscripts.
As I remember I couldn't find a working substitute for it, to stop script's execution.

User script managers may be enclosing it in a function, making it work fine there. Greasy Fork is analyzing it as-is.