Error_log file give errors in the file "PWS_quakes_load.php"

For some time now I have again received error messages in the error_log file regarding “PWS_quakes_load.php” on line 59.
“Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /home/meteocul/public_html/pwsWD/PWS_quakes_load.php:59”.
I remember that I had this also so around a year back (could not find it again in this forum) and after an adjustment by Wim this also disappeared, but now it seems to be back.
Not a big problem in itself, but it keeps coming up now and then, see error log file.

Greetings Arie (561 Bytes)