diff --git a/lib/Pool.js b/lib/Pool.js
index f59dcce..b9e125f 100644
--- a/lib/Pool.js
+++ b/lib/Pool.js
@@ -294,6 +294,7 @@ class Pool {
         this.connect((error, connection) => {
           if (error) {
             reject(error);
+            return;
           }
 
           connection.query(sql, parameters, options, (error, result) => {