AIKIDO-2026-113068

TL;DR

The NIP-50 event-matching path searches event content using a sliding window sized from the search string length. An empty search string produces a zero-sized window, which always panics instead of returning a result. Filters carrying an empty search value therefore terminate the process rather than raising a catchable error, and the value can reach that path through direct filter matching, the bundled local relay, or in-memory database queries. The fix handles empty searches before the substring search so the matcher returns a defined result without panicking.