[Bug]: ErrorException: Undefined array key 0 when an event is created in the past

### Describe the bug

```
Internal error: ErrorException: Undefined array key 0
Internal error in .\libraries\classes\Database\Events.php#17
```

### How to Reproduce

1. Go to `Events`
2. Create new event
3. See error

### Screenshots

https://github.com/user-attachments/assets/f188aa0f-2685-4f0d-bfd8-5c3d36fd35c2

### phpMyAdmin version

5.2.4-dev, 6.0.0-dev