Poll billing script not working

[root@cia observium]# /opt/observium/poll-billing.php 

Starting Polling Session ... Bill : TheJnet    ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

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array_merge(): Argument #2 must be of type array, null given in /home/observium/poll-billing.php:88Stack trace:#0: (unknown function) called at [/home/observium/poll-billing.php:88]

83: foreach ($entities as $entity) {

84: $now = time();

85: switch ($entity['entity_type']) {

86: case "port":

87: 

88: $entity = array_merge($entity, dbFetchRow("SELECT * FROM `ports` as P, `devices` as D WHERE P.`port_id` = ? AND D.device_id = P.device_id", [$entity['entity_id']]));

89: 

90: echo("\nPolling " . $entity['ifDescr'] . " on " . $entity['hostname'] . "\n");

91: if ($entity['status'] == '0') {

92: echo "Port Device is DOWN!\n";

93: } elseif ($entity['deleted'] == '1') {#1: array_merge called at [/home/observium/poll-billing.php:88]

83: foreach ($entities as $entity) {

84: $now = time();

85: switch ($entity['entity_type']) {

86: case "port":

87: 

88: $entity = array_merge($entity, dbFetchRow("SELECT * FROM `ports` as P, `devices` as D WHERE P.`port_id` = ? AND D.device_id = P.device_id", [$entity['entity_id']]));

89: 

90: echo("\nPolling " . $entity['ifDescr'] . " on " . $entity['hostname'] . "\n");

91: if ($entity['status'] == '0') {

92: echo "Port Device is DOWN!\n";

93: } elseif ($entity['deleted'] == '1') {#2: poll_bill called at [/home/observium/poll-billing.php:67]

62: if ($bill['bill_type'] == "quota" && !is_numeric($bill['bill_quota'])) {

63: $bill['bill_quota'] = $bill['bill_gb'] * $config['billing']['base'] * $config['billing']['base'];

64: dbUpdate(['bill_quota' => $bill['bill_quota']], 'bills', '`bill_id` = ?', [$bill['bill_id']]);

65: echo("Quota -> " . $bill['bill_quota']);

66: }

67: poll_bill($bill);

68: $iter++;

69: }

70: 

71: // MOVEME. includes/billing.inc.php

72: function poll_bill($bill) {