Compare chart shows NaN on the Y axis

For example: https://npmx.dev/compare?packages=react,react-dom

No matter which time frame you pick, the Y axis shows `NaN`

<img width="707" height="564" alt="Image" src="https://github.com/user-attachments/assets/3586936e-f33a-4222-b599-2d651091a692" />