diff --git a/zabbix-send-mariadb-metrics.php b/zabbix-send-mariadb-metrics.php
index 5de9f68..dddd6d3 100755
--- a/zabbix-send-mariadb-metrics.php
+++ b/zabbix-send-mariadb-metrics.php
@@ -1,211 +1,211 @@
 #!/usr/bin/env php
 <?php
 /**
  * @author  Valerio Bozzolan
  * @license GNU AGPLv3+ (same license of Zabbix)
  * @date    2025-12-17
  */
 
 $DAEMON_SLEEP_SECONDS_INIT      = getenv_or_default_int('DAEMON_SLEEP_SECONDS_INIT', 120);
 $DAEMON_SLEEP_SECONDS_LOOP      = getenv_or_default_int('DAEMON_SLEEP_SECONDS_LOOP', 6);
 $DAEMON_DISCOVERY_EVERY_N_LOOPS = getenv_or_default_int('DAEMON_DISCOVERY_EVERY_N_LOOPS', 100);
 $ZABBIX_CONFIG                  = getenv_or_default('ZABBIX_CONFIG', '/etc/zabbix/zabbix_agentd.conf');
 
 $databases_info = [];
 $databases_info_default = [
 	'sleeps' => 0,
 ];
 
 log_msg('INFO', "Waiting DAEMON_SLEEP_SECONDS_INIT=$DAEMON_SLEEP_SECONDS_INIT seconds for the initial warmup.");
 sleep($DAEMON_SLEEP_SECONDS_INIT);
 
 /* DATABASE SETUP START */
 $mysqli = null;
 mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
 /* DATABASE SETUP END */
 
 /* DAEMON START */
 $i = 0;
 while (true) {
 	// Start again the database connection, if needed.
 	if (!$mysqli) {
 		$mysqli = mysqli_start();
 	}
 
 	// Run the Zabbix discovery of database names.
 	// Run this always at startup.
 	// Run this also again after some loops.
 	// We reduce the amount of times we run the Discovery, as micro-optimization.
 	if (($i % $DAEMON_DISCOVERY_EVERY_N_LOOPS) === 0) {
 		log_msg('INFO', "Zabbix Discovery of database names...");
 		zabbix_discovery_databases($mysqli);
 		log_msg('INFO', "Zabbix Discovery of database names... Completed");
 	}
 
 	// Send amount of current MariaDB connections.
-	$mariadb_connections = query_row($mysqli, "SHOW STATUS WHERE variable_name = 'Threads_connected'")->Value;
+	$mariadb_connections = (int) query_row($mysqli, "SHOW STATUS WHERE variable_name = 'Threads_connected'")->Value;
 	zabbix_sender_key_value('er.mariadb.connections', $mariadb_connections);
 
 	// Count all 'Sleep' queries.
 	// Send the Zabbix items.
 	zabbix_send_database_sleeps($mysqli);
 
 	// Free the connection ASAP.
 	// Since, if you want to monitor connections,
 	// probably it means we don't have many free connections...
 	$mysqli->close();
 	$mysqli = null;
 
 	// Cleanup data
 	foreach ($databases_info as $database_name => $database_info) {
 		$databases_info[$database_name] = $databases_info_default;
 	}
 
 	$i++;
 
 	// Do not flood the MariaDB server.
 	log_msg('INFO', "Waiting DAEMON_SLEEP_SECONDS_LOOP={$DAEMON_SLEEP_SECONDS_LOOP} seconds for the next data collection #{$i}.");
 	sleep($DAEMON_SLEEP_SECONDS_LOOP);
 }
 /* DAEMON END */
 
 
 /* FUNCTIONS START */
 
 function zabbix_send_database_sleeps(mysqli $mysqli): void {
 	global $databases_info;
 	global $databases_info_default;
 
 	$results = query_results($mysqli, 'SHOW FULL PROCESSLIST');
 	foreach ($results as $row) {
 		$db = $row->db;
 
 		// Skip MariaDB "event schedulers".
 		if ($db === null) {
 			continue;
 		}
 
 		$databases_info[$db] ??= $databases_info_default;
 
 		$database_command_lower = strtolower($row->Command);
 		if ($database_command_lower === 'sleep') {
 			$databases_info[$db]['sleeps']++;
 		}
 	}
 
 	// Send all Zabbix values.
 	foreach ($databases_info as $database_name => $database_info) {
 		$zabbix_item_key = sprintf(
 			'er.mariadb.database[%s,sleeps]',
 			$database_name
 		);
 		zabbix_sender_key_value($zabbix_item_key, $database_info['sleeps']);
 	}
 }
 
 function zabbix_discovery_databases(mysqli $mysqli): void {
 	global $databases_info;
 	global $databases_info_default;
 
 	// Find all databases, for the Zabbix discovery.
 	$results = query_results($mysqli, 'SHOW DATABASES');
 	foreach ($results as $row) {
 		$db = $row->Database;
 		$databases_info[$db] ??= $databases_info_default;
 	}
 
 	// Populate the Zabbix Discovery, sending all database names in a single JSON.
 	// TODO: Run this less than once per hour.
 	$payload = [
 		'data' => [],
 	];
 	foreach ($databases_info as $database_name => $database_info) {
 		$payload['data'][] = [
 			'{#DB}' => $database_name,
 		];
 	}
 	$value = json_encode($payload);
 	zabbix_sender_key_value('er.mariadb.database.discovery', $value);
 }
 
 function query_results(mysqli $mysqli, string $query): Generator {
 	$result = $mysqli->query($query);
 	while ($row = $result->fetch_object()) {
 		yield $row;
 	}
 	$result->close();
 }
 
 function query_row(mysqli $mysqli, string $query): stdclass {
 	foreach (query_results($mysqli, $query) as $row) {
 		return $row;
 	}
 	throw new Exception("No results from this query:\n{$query}");
 }
 
 function zabbix_sender_key_value(string $key, string $value): void {
 	global $ZABBIX_CONFIG;
 
 	$command = sprintf('zabbix_sender -c %s --key %s --value %s',
 		escapeshellarg($ZABBIX_CONFIG),
 		escapeshellarg($key),
 		escapeshellarg($value)
 	);
 
 	// Execute the command and capture the output for logging purposes.
 	ob_start();
 
 		// Include the original command in the logger, and its output.
 		echo '$ ' . $command;
 		echo "\n";
 		passthru($command);
 
 	$log_msg = ob_get_contents();
 	ob_end_clean();
 	log_msg('DEBUG', $log_msg);
 }
 
 function mysqli_start(): mysqli {
 	// Connect to MariaDB.
 	// Use 'null' as hostname to just use the Unix socket,
 	// so we can auto-magically login.
 	$mysqli = new mysqli(null, 'root');
 
 	$mysqli->set_charset('utf8mb4');
 
 	return $mysqli;
 }
 
 function getenv_or_default_int(string $envname, int $default): int {
 	$value = getenv_or_default($envname, (string)$default);
 	if (!is_numeric($value)) {
 		throw new Exception("Failed to parse ENV variable $envname. Received $value. Not an integer.");
 	}
 	return (int)$value;
 
 }
 
 function getenv_or_default(string $envname, string $default): string {
 	$value = getenv($envname);
 	if ($value === false) {
 		$value = $default;
 	}
 
 	log_msg('DEBUG', "Got ENV $envname={$value}.");
 
 	return $value;
 }
 
 function log_msg(string $severity, string $msg): void {
 	$severity = sprintf('%-5s', $severity);
 
 	$lines = explode("\n", $msg);
 	foreach ($lines as $i => $line) {
 		if ($i) {
 			$line = "  $line";
 		}
 		echo "[$severity] $line\n";
 	}
 }
 
 /* FUNCTIONS END */