diff --git a/mysql.d b/mysql.d
index 40c5759..4a5f1a0 100644
--- a/mysql.d
+++ b/mysql.d
@@ -229,7 +229,10 @@ class MySql : Database {
 	}
 
 	void close() {
-		mysql_close(mysql);
+		if(mysql) {
+			mysql_close(mysql);
+			mysql = null;
+		}
 	}
 
 	~this() {