There are several possible reasons why this error might occur:
SolidTorrents uses a standard URL structure: https://solidtorrents.to/search?q=your+keyword . If something modifies this URL—such as a browser extension (ad-blocker, script blocker) or a malformed link—the q= parameter might be stripped out. The page loads, looks for the query parameter, fails, and spits out "undefined." Search Results for undefined - SolidTorrents