diff --git a/lib/CustomMySQL.js b/lib/CustomMySQL.js
index 019c8b0..9351f3a 100644
--- a/lib/CustomMySQL.js
+++ b/lib/CustomMySQL.js
@@ -4,8 +4,6 @@ Object.defineProperty(exports, "__esModule", {
     value: true
 });
 
-var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol ? "symbol" : typeof obj; };
-
 var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
 
 var _Transaction = require('./Transaction');
@@ -63,10 +61,6 @@ var CustomMySQL = function () {
                 throw new Error('key should be a string');
             }
 
-            if ((typeof config === 'undefined' ? 'undefined' : _typeof(config)) !== 'object') {
-                throw new Error('config should be an object');
-            }
-
             this._key = key;
             this[key] = { config: config };
             this[key].is_pool = !!is_pool;
diff --git a/src/CustomMySQL.js b/src/CustomMySQL.js
index edeb154..33c52a5 100644
--- a/src/CustomMySQL.js
+++ b/src/CustomMySQL.js
@@ -37,10 +37,6 @@ export default class CustomMySQL {
             throw new Error('key should be a string');
         }
 
-        if (typeof config !== 'object') {
-            throw new Error('config should be an object');
-        }
-
         this._key = key;
         this[key] = {config};
         this[key].is_pool = !!is_pool;
diff --git a/test/test.js b/test/test.js
index a26de4c..dfb9245 100644
--- a/test/test.js
+++ b/test/test.js
@@ -2,12 +2,8 @@
 
 const should = require('chai').should();
 const CustomMySQL = require(process.cwd() + '/lib/CustomMySQL').default;
-const FREE_DB = {
-    host: 'localhost',
-    user: 'root',
-    password: '',
-    database: 'test'
-};
+
+const FREE_DB = 'mysql://root:@localhost/test';
 const FREE_DB2 = {
     host: 'localhost',
     user: 'root',
@@ -122,18 +118,6 @@ describe('Overall test', () => {
 
 
 
-    it ('mysql.add should throw an error if config is not an object', (done) => {
-        const mysql = new CustomMySQL();
-
-        (() => {
-            mysql.add('key', 1);
-        }).should.throw(Error, 'config should be an object');
-
-        done();
-    });
-
-
-
     it ('mysql.add should create a property for a newly added key-config pair', (done) => {
         const mysql = new CustomMySQL();