The lit_mcp_allowed_roles filter could return a non-array, causing array_filter() to throw TypeError in PHP 8.1+. Now fallback to ['administrator'] if filter result is not an array. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7