Warning: Undefined array key 0 in /mnt/web120/e0/93/5175193/htdocs/php/photovoltaik/db_pvchart.php on line 756

Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /mnt/web120/e0/93/5175193/htdocs/php/photovoltaik/db_pvchart.php:756
Stack trace:
#0 {main}
  thrown in /mnt/web120/e0/93/5175193/htdocs/php/photovoltaik/db_pvchart.php on line 756