Plugin produces critical Error

[camilomartins]

Plugin produces critical error at API Endpoint:

Wordpress shows the following error:
Fatal error: Uncaught TypeError: array_filter(): Argument #1 ($array) must be of type array, null given in /var/www/vhosts/arrenberg.app/httpdocs/wp/wp-content/plugins/display-api.php:112 Stack trace: #0 /var/www/vhosts/arrenberg.app/httpdocs/wp/wp-content/plugins/display-api.php(112): array_filter() #1 /var/www/vhosts/arrenberg.app/httpdocs/wp/wp-includes/template-loader.php(106): include('...') #2 /var/www/vhosts/arrenberg.app/httpdocs/wp/wp-blog-header.php(19): require_once('...') #3 /var/www/vhosts/arrenberg.app/httpdocs/wp/index.php(17): require('...') #4 {main} thrown in /var/www/vhosts/arrenberg.app/httpdocs/wp/wp-content/plugins/display-api.php on line 112

This error caused errors for the digital street signs, so they're not working properly.

I fixed the error for now with checking if the Variable $energie_wetter is set and it seems to be working again.
I guess this error only occurs, when the Energiewetter API is not working.

Should be checked some day, but for now everything is working again.