Exim Mail queue script not working

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

explode(): Argument #2 ($string) must be of type string, array given in /opt/observium/includes/polling/applications/exim.inc.php:17

Stack trace:

#0: (unknown function) called at [/opt/observium/includes/polling/applications/exim.inc.php:17]
12: */
13: 
14: if (!empty($agent_data['app']['exim'])) {
15: $app_id = discover_app($device, 'exim');
16: 
17: foreach (explode("\n", $agent_data['app']['exim']) as $line)

{ 18: [$item, $value] = explode(":", $line, 2); 19: $exim_data[trim($item)] = trim($value); 20: }

21: 
22: rrdtool_update_ng($device, 'exim', $exim_data, $app_id);

#1: explode called at [/opt/observium/includes/polling/applications/exim.inc.php:17]
12: */
13: 
14: if (!empty($agent_data['app']['exim'])) {
15: $app_id = discover_app($device, 'exim');
16: 
17: foreach (explode("\n", $agent_data['app']['exim']) as $line)

{ 18: [$item, $value] = explode(":", $line, 2); 19: $exim_data[trim($item)] = trim($value); 20: }

21: 
22: rrdtool_update_ng($device, 'exim', $exim_data, $app_id);

#2: include called at [/opt/observium/includes/polling/applications.inc.php:51]
46: echo $app_type . ' ';
47: 
48: // One include per application type. Multiple instances currently handled within the application code
49: $app_include = $config['install_dir'] . '/includes/polling/applications/' . $app_type . '.inc.php';
50: if (is_file($app_include))

{ 51: include($app_include); 52: }

else

{ 53: echo($app_type . ' include missing! '); 54: }

55: 
56: }

#3: 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: 

#4: 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);
194: