Alert -> VRF unknown function

array_merge(): Argument #2 must be of type array, null given in /opt/observium/includes/alerts.inc.php:2887

#0: (unknown function) called at [/opt/observium/includes/alerts.inc.php:2887]

2882: 'group_id' => [ 'label' => 'Group', 'descr' => 'Group Membership', 'type' => 'string', 'values' => 'group' ],

2883: 'group' => [ 'label' => 'Group (Free)', 'descr' => 'Group Membership', 'type' => 'string', 'operators' => 'match, notmatch' ]

2884: ];

2885: //$config['entities'][$entity]['attribs']['group_id'] = array('label' => 'Group', 'descr' => 'Group Membership', 'type' => 'string', 'values' => 'group');

2886: //$config['entities'][$entity]['attribs']['group'] = array('label' => 'Group (Free)', 'descr' => 'Group Membership', 'type' => 'string', 'operators' => 'match, notmatch');

2887: $def[$type] = array_merge($add_group, $def[$type]);

2888: }

2889:

2890: foreach ($def[$type] as $attrib_id => $attrib) {

2891: $attrib['entity_type'] = $entity_type;

2892: $attrib['attrib_id'] = $attrib_id;

#1: array_merge called at [/opt/observium/includes/alerts.inc.php:2887]

2882: 'group_id' => [ 'label' => 'Group', 'descr' => 'Group Membership', 'type' => 'string', 'values' => 'group' ],

2883: 'group' => [ 'label' => 'Group (Free)', 'descr' => 'Group Membership', 'type' => 'string', 'operators' => 'match, notmatch' ]

2884: ];

2885: //$config['entities'][$entity]['attribs']['group_id'] = array('label' => 'Group', 'descr' => 'Group Membership', 'type' => 'string', 'values' => 'group');

2886: //$config['entities'][$entity]['attribs']['group'] = array('label' => 'Group (Free)', 'descr' => 'Group Membership', 'type' => 'string', 'operators' => 'match, notmatch');

2887: $def[$type] = array_merge($add_group, $def[$type]);

2888: }

2889:

2890: foreach ($def[$type] as $attrib_id => $attrib) {

2891: $attrib['entity_type'] = $entity_type;

2892: $attrib['attrib_id'] = $attrib_id;

#2: generate_querybuilder_filters called at [/opt/observium/includes/alerts.inc.php:2930]

2925: });";

2926:

2927: register_html_resource('script', $rulescript);

2928: }

2929:

2930: $filters = ' [ ' . implode(', ', generate_querybuilder_filters($entity_type, $type)) . ' ] ';

2931:

2932: //$form_id = 'builder-'.$entity_type.'-'.$type;

2933:

2934: echo('

2935:

#3: generate_querybuilder_form called at [/opt/observium/html/pages/add_alert_check.inc.php:373]

368:

369: $form_id = 'rules-' . random_string(8);

370:

371: echo '<div id="' . $form_id . '"></div>';

372:

373: generate_querybuilder_form($vars['entity_type'], 'attribs', $form_id, $alert_dupe['alert_assoc']);

374:

375: // generate_querybuilder_form($vars['entity_type'], 'metrics');

376:

377:

378: $footer_content = '

#4: include called at [/opt/observium/html/index.php:253]

248: </div>

249: </div>

250: <div class="col-xl-8 col-lg-12">';

251: }

252:

253: include($page_file);

254: echo '</div>';

255: }

256:

257: // Register default panel if custom not set

258: if (!isset($GLOBALS['cache_html']['page_panel'])) {