I get an error when polling a device

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Oops! Something went wrong! You may want to report this to the Observium developers.

Call to undefined function mb_ord() in /opt/observium/includes/common.inc.php:4972

Stack trace:

#0: (unknown function) called at [/opt/observium/includes/common.inc.php:4972]

4967: * "\u00cb\u0419\u0426\u0423\u041a\u0415\u041d\u0413\u0428\u0429\u0417\u0425\u042a\u0424\u042b\u0412\u0410\u041f\u0420\u041e\u041b\u0414\u0416\u042d\u042f\u0427\u0421\u041c\u0418\u0422\u042c\u0411\u042e"

4968: */

4969: function fix_json_unicode($string)

4970: {

4971: return preg_replace_callback('/([\x\{0080}-\x\{FFFF}])/u', function ($match) {

4972: return '\\u' . str_pad(dechex(mb_ord($match[1], 'UTF-8')), 4, '0', STR_PAD_LEFT);

4973: }, $string);

4974: }

4975: 

4976: function safe_unserialize($str)

4977: {

#1: \{closure} called at [(unknown file):(unknown line)]

#2: preg_replace_callback called at [/opt/observium/includes/common.inc.php:4973]

4968: */

4969: function fix_json_unicode($string)

4970: {

4971: return preg_replace_callback('/([\x\{0080}-\x\{FFFF}])/u', function ($match) {

4972: return '\\u' . str_pad(dechex(mb_ord($match[1], 'UTF-8')), 4, '0', STR_PAD_LEFT);

4973: }, $string);

4974: }

4975: 

4976: function safe_unserialize($str)

4977: {

4978: if (is_array($str)) {

#3: fix_json_unicode called at [/opt/observium/includes/common.inc.php:4946]

4941: // Try to fix "Control character error, possibly incorrectly encoded"

4942: $str_fix = preg_replace('/[[:cntrl:]]/', '', smart_quotes($str));

4943: print_debug_vars($str_fix);

4944: } else {

4945: // Try fix utf errors

4946: $str_fix = fix_json_unicode(smart_quotes($str));

4947: print_debug_vars($str_fix);

4948: }

4949: $json_fix = @json_decode($str_fix, TRUE, 512, $options);

4950: if (json_last_error() === JSON_ERROR_NONE) {

4951: //print_vars(smart_quotes(fix_json_unicode($str)));

#4: safe_json_decode called at [/opt/observium/includes/http.inc.php:611]

606: 

607: // If response return valid code and content, additional parse for specific defined tests

608: if ($success) {

609: // Decode if request OK

610: if ($is_response_array) {

611: $response = safe_json_decode($response);

612: }

613: // else additional formats?

614: 

615: // Check if call succeeded

616: if (isset($def['response_test'])) {

#5: test_http_request called at [/opt/observium/includes/http.inc.php:712]

707: $request_status = FALSE;

708: // Send out API call and parse response

709: for ($retry = 1; $retry <= (int)$request_retry; $retry++) {

710: print_debug("Request [$url] #$retry:");

711: $response = get_http_request($url, $options, $ratelimit);

712: if ($request_status = test_http_request($def, $response)) {

713: // stop for on success

714: return $request_status;

715: }

716: // wait little time

717: sleep($request_sleep);

#6: process_http_request called at [/opt/observium/includes/geolocation.inc.php:339]

334: 

335: // API URL to POST to

336: $url = generate_http_url($geo_def, $tags);

337: 

338: // First or second request

339: if (process_http_request($geo_def, $url, $options, $mapresponse)) {

340: 

341: switch ($geo_def['response_format']) {

342: case 'xml':

343: // Hrm, currently unused

344: break;

#7: get_geo_http_def called at [/opt/observium/includes/geolocation.inc.php:142]

137: $address_second = $geo_type === 'forward' ? generate_location_alt($address) : NULL;

138: 

139: // Generate geolocation tags, used for rewrites in definition

140: $tags = generate_geolocation_tags($location['location_geoapi'], $location);

141: 

142: $data = get_geo_http_def($geo_def, $geo_type, $tags, $debug_msg);

143: 

144: if (!$data) {

145: // Return an old array with new status (for later recheck)

146: unset($geo_db['hostname'], $geo_db['location_updated']);

147: $location['location_status']  = $debug_msg;

#8: get_geolocation called at [/opt/observium/includes/polling/system.inc.php:311]

306: print_debug_vars($geo_db);

307: 

308: $geo_detect = geo_detect($device, $poll_device, $geo_db, $dns_only);

309: 

310: if ($geo_detect || $dns_only) {

311: $update_geo = get_geolocation($poll_device['sysLocation'], $geo_db, $dns_only);

312: if ($update_geo) {

313: print_debug_vars($update_geo, 1);

314: if (is_numeric($update_geo['location_lat']) && is_numeric($update_geo['location_lon']) && $update_geo['location_country'] !== 'Unknown') {

315: $geo_msg = 'Geolocation (' . strtoupper($update_geo['location_geoapi']) . ') -> ';

316: $geo_msg .= '[' . sprintf('%f', $update_geo['location_lat']) . ', ' . sprintf('%f', $update_geo['location_lon']) . '] ';

#9: include called at [/opt/observium/includes/polling/functions.inc.php:314]

309: 

310: print_cli_heading("Module Start: %R" . $module);

311: 

312: $m_start = utime();

313: 

314: include($config['install_dir'] . "/includes/polling/$module.inc.php");

315: 

316: $m_run                                    = elapsed_time($m_start, 4);

317: $device_state['poller_mod_perf'][$module] = $m_run;

318: print_cli_data("Module time", format_number_short($m_run, 4) . "s");

319: 

#10: poll_device called at [/opt/observium/poller.php:189]

184: $params[] = $config['poller_id'];

185: }

186: 

187: foreach (dbFetchColumn($query, $params) as $device_id) {

188: $device = dbFetchRow("SELECT * FROM `devices` WHERE `device_id` = ?", [ $device_id ]);

189: poll_device($device, $options);

190: $polled_devices++;

191: }

192: 

193: $poller_time = elapsed_time($poller_start, 4);