[BUG] Game crashes when going into a weekend

[John21-25]

Describe the bug
Modified the calendar to reproduce the 2025 one, and forgot to put Bahrain and Jeddah back on Sundays, so after Round 3 (Japan) I went to change the dates of Bahrain and Jeddah from a Saturday race to a Sunday one, but when Bahrain comes, it crashes whenever I try to manage FP1. Another note is that in the web browser it registers as "Round -1"

To Reproduce
Steps to reproduce the behavior:

1. Go to "F1 Manager Save Browser"
2. Click on "Regulations>Calendar>Bahrain/Jeddah>Day>Sunday"
3. Open "F1 Manager"
4. Play modified save file
5. See error when trying to manage FP1

Expected behavior
Nothing

Screenshots
N/A

Additional context
N/A