diff --git a/model/connect/MySQLiConnector.php b/model/connect/MySQLiConnector.php
index 6ffa401c6..f56a6649b 100644
--- a/model/connect/MySQLiConnector.php
+++ b/model/connect/MySQLiConnector.php
@@ -96,7 +96,7 @@ class MySQLiConnector extends DBConnector {
 	}
 
 	public function __destruct() {
-		if ($this->dbConn) {
+		if (is_resource($this->dbConn)) {
 			mysqli_close($this->dbConn);
 			$this->dbConn = null;
 		}