Undefined array key 0 in MentionManager

[blued-gear]

Logline:

{
  "message": "Warning: Undefined array key 0",
  "context": {
    "exception": {
      "class": "ErrorException",
      "message": "Warning: Undefined array key 0",
      "code": 0,
      "file": "/app/src/Service/MentionManager.php:65"
    }
  },
  "level": 400,
  "level_name": "ERROR",
  "channel": "php",
  "datetime": "2025-11-05T00:10:20.207068+00:00",
  "extra": {}
}