diff --git a/ManiaControl.php b/ManiaControl.php
index 3ba6598b..57bcf10a 100644
--- a/ManiaControl.php
+++ b/ManiaControl.php
@@ -9,6 +9,8 @@
 
 // Enable error reporting
 error_reporting(E_ALL);
+// Change MySQLi report to match with policy before PHP 8.1
+mysqli_report(MYSQLI_REPORT_OFF);
 
 // Run configuration
 define('LOG_NAME_USE_DATE', true); // Use current date as suffix for log file name in logs folder
diff --git a/core/Commands/HelpManager.php b/core/Commands/HelpManager.php
index 6de5c72a..a69d91b9 100644
--- a/core/Commands/HelpManager.php
+++ b/core/Commands/HelpManager.php
@@ -280,7 +280,7 @@ class HelpManager implements CommandListener, CallbackListener, ManialinkPageAns
 	 * @param string $description
 	 * @param string $method
 	 */
-	public function registerCommand($name, $adminCommand = false, $description = '', $method) {
+	public function registerCommand($name, $adminCommand = false, $description = '', $method = '') {
 		// TODO replace with new class Command
 		if ($adminCommand) {
 			array_push($this->adminCommands, array("Name" => $name, "Description" => $description, "Method" => $method));
diff --git a/core/Statistics/StatisticManager.php b/core/Statistics/StatisticManager.php
index 218fca47..5324e387 100644
--- a/core/Statistics/StatisticManager.php
+++ b/core/Statistics/StatisticManager.php
@@ -571,7 +571,7 @@ class StatisticManager implements UsageInformationAble {
 	 * @param string $statType
 	 * @return bool
 	 */
-	public function insertStat($statName, Player $player, $serverIndex = -1, $value, $statType = self::STAT_TYPE_INT) {
+	public function insertStat($statName, Player $player, $serverIndex = -1, $value = 0, $statType = self::STAT_TYPE_INT) {
 		// TODO: statType isn't used
 		if (!$player) {
 			return false;
diff --git a/libs/curl-easy/cURL/RequestsQueue.php b/libs/curl-easy/cURL/RequestsQueue.php
index 4b99826b..2f9529d6 100644
--- a/libs/curl-easy/cURL/RequestsQueue.php
+++ b/libs/curl-easy/cURL/RequestsQueue.php
@@ -131,7 +131,7 @@ class RequestsQueue extends EventDispatcher implements RequestsQueueInterface, \
 	 *
 	 * @return int    Handles count
 	 */
-	public function count() {
+	public function count(): int {
 		return count($this->queue);
 	}