diff --git a/.travis.yml b/.travis.yml
index 9b37e36b598..2a9d6807876 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,9 +51,11 @@ addons:
     - php7.1-pgsql
     - php7.1-mysqli
     - php7.1-xml
+    - php7.1-intl
     - php8.1-pgsql
     - php8.1-mysqli
     - php8.1-xml
+    - php8.1-intl
     
 env:
   global:
diff --git a/htdocs/core/db/DoliDB.class.php b/htdocs/core/db/DoliDB.class.php
index aae315ec992..a3367841481 100644
--- a/htdocs/core/db/DoliDB.class.php
+++ b/htdocs/core/db/DoliDB.class.php
@@ -29,7 +29,7 @@ require_once DOL_DOCUMENT_ROOT.'/core/db/Database.interface.php';
  */
 abstract class DoliDB implements Database
 {
-	/** @var bool|resource|SQLite3 Database handler */
+	/** @var bool|resource|SQLite3|PgSql\connection Database handler */
 	public $db;
 	/** @var string Database type */
 	public $type;
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 0009ba93240..59570bffeea 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -1164,7 +1164,17 @@ function dol_buildpath($path, $type = 0, $returnemptyifnotfound = 0)
 function dol_clone($object, $native = 0)
 {
 	if (empty($native)) {
+		$tmpsavdb = null;
+		if (isset($object->db) && isset($object->db->db) && is_object($object->db->db) && get_class($object->db->db) == 'PgSql\Connection') {
+			$tmpsavdb = $object->db;
+			unset($object->db);		// Such property can not be serialized when PgSql/Connection
+		}
+
 		$myclone = unserialize(serialize($object));	// serialize then unserialize is hack to be sure to have a new object for all fields
+
+		if ($tmpsavdb) {
+			$object->db = $tmpsavdb;
+		}
 	} else {
 		$myclone = clone $object; // PHP clone is a shallow copy only, not a real clone, so properties of references will keep the reference (refering to the same target/variable)
 	}
@@ -3723,6 +3733,8 @@ function isValidMXRecord($domain)
 			return 0;
 		}
 	}
+
+	// function idn_to_ascii or checkdnsrr does not exists
 	return -1;
 }
 
@@ -4957,7 +4969,9 @@ function dol_print_error($db = '', $error = '', $errors = null)
 
 	// Return a http header with error code if possible
 	if (!headers_sent()) {
-		top_httphead();
+		if (function_exists('top_httphead')) {	// In CLI context, the method does not exists
+			top_httphead();
+		}
 		http_response_code(500);
 	}
 
diff --git a/test/phpunit/FunctionsLibTest.php b/test/phpunit/FunctionsLibTest.php
index 47de2cbebcc..0b6feb18903 100644
--- a/test/phpunit/FunctionsLibTest.php
+++ b/test/phpunit/FunctionsLibTest.php
@@ -29,6 +29,7 @@ global $conf,$user,$langs,$db;
 //require_once 'PHPUnit/Autoload.php';
 require_once dirname(__FILE__).'/../../htdocs/master.inc.php';
 require_once dirname(__FILE__).'/../../htdocs/core/lib/date.lib.php';
+require_once dirname(__FILE__).'/../../htdocs/product/class/product.class.php';
 
 if (! defined('NOREQUIREUSER')) {
 	define('NOREQUIREUSER', '1');
@@ -166,6 +167,30 @@ class FunctionsLibTest extends PHPUnit\Framework\TestCase
 		print __METHOD__."\n";
 	}
 
+	/**
+	 * testDolClone
+	 *
+	 * @return void
+	 */
+	public function testDolClone()
+	{
+		$newproduct1 = new Product($this->savdb);
+
+		print __METHOD__." this->savdb has type ".(is_resource($this->savdb->db) ? get_resource_type($this->savdb->db) : (is_object($this->savdb->db) ? 'object' : 'unknown'))."\n";
+		print __METHOD__." newproduct1->db->db has type ".(is_resource($newproduct1->db->db) ? get_resource_type($newproduct1->db->db) : (is_object($newproduct1->db->db) ? 'object' : 'unknown'))."\n";
+		$this->assertEquals($this->savdb->connected, 1, 'Savdb is connected');
+		$this->assertNotNull($newproduct1->db->db, 'newproduct1->db is not null');
+
+		$newproductcloned1 = dol_clone($newproduct1);
+
+		print __METHOD__." this->savdb has type ".(is_resource($this->savdb->db) ? get_resource_type($this->savdb->db) : (is_object($this->savdb->db) ? 'object' : 'unknown'))."\n";
+		print __METHOD__." newproduct1->db->db has type ".(is_resource($newproduct1->db->db) ? get_resource_type($newproduct1->db->db) : (is_object($newproduct1->db->db) ? 'object' : 'unknown'))."\n";
+		$this->assertEquals($this->savdb->connected, 1, 'Savdb is connected');
+		$this->assertNotNull($newproduct1->db->db, 'newproduct1->db is not null');
+
+		//print __METHOD__." newproductcloned1->db must be null\n";
+		//$this->assertNull($newproductcloned1->db, 'newproductcloned1->db is null');
+	}
 
 	/**
 	 * testNum2Alpha