NULL
Fatal error: Uncaught TypeError: array_column(): Argument #1 ($array) must be of type array, null given in /in/fvZ8pu:5
Stack trace:
#0 /in/fvZ8pu(5): array_column(NULL, NULL, 'key')
#1 {main}
thrown in /in/fvZ8pu on line 5
Process exited with code 255.