diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index ec05ad5d98d..dfc324c1c00 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -465,7 +465,7 @@ abstract class CommonDocGenerator
 		$array_key.'_total_localtax2'=>price2num($object->total_localtax2),
 		$array_key.'_total_ttc'=>price2num($object->total_ttc),
 
-		$array_key.'_multicurrency_code' => price2num($object->multicurrency_code),
+		$array_key.'_multicurrency_code' => $object->multicurrency_code,
 		$array_key.'_multicurrency_tx' => price2num($object->multicurrency_tx),
 		$array_key.'_multicurrency_total_ht' => price2num($object->multicurrency_total_ht),
 		$array_key.'_multicurrency_total_tva' => price2num($object->multicurrency_total_tva),
diff --git a/htdocs/core/lib/website2.lib.php b/htdocs/core/lib/website2.lib.php
index 0258d3d2c05..cb96ed9ca43 100644
--- a/htdocs/core/lib/website2.lib.php
+++ b/htdocs/core/lib/website2.lib.php
@@ -108,6 +108,8 @@ function dolSavePageAlias($filealias, $object, $objectpage)
 			$dirname = dirname($filealias);
 			$filename = basename($filealias);
 			foreach (explode(',', $object->otherlang) as $sublang) {
+                // Avoid to erase main alias file if $sublang is empty string
+				if (empty(trim($sublang))) continue;
 				$filealiassub = $dirname.'/'.$sublang.'/'.$filename;
 
 				$aliascontent = '<?php'."\n";
diff --git a/htdocs/fourn/class/paiementfourn.class.php b/htdocs/fourn/class/paiementfourn.class.php
index bb0ecbcfa7c..78bfa6ebff2 100644
--- a/htdocs/fourn/class/paiementfourn.class.php
+++ b/htdocs/fourn/class/paiementfourn.class.php
@@ -83,7 +83,7 @@ class PaiementFourn extends Paiement
 	 *	Load payment object
 	 *
 	 *	@param	int		$id         Id if payment to get
-	 *  @param	string	$ref		Ref of payment to get (currently ref = id but this may change in future)
+	 *  @param	string	$ref		Ref of payment to get
 	 *  @param	int		$fk_bank	Id of bank line associated to payment
 	 *  @return int		            <0 if KO, -2 if not found, >0 if OK
 	 */
@@ -101,7 +101,7 @@ class PaiementFourn extends Paiement
 		if ($id > 0)
 			$sql .= ' AND p.rowid = '.$id;
 		elseif ($ref)
-			$sql .= ' AND p.rowid = '.$ref;
+			$sql .= ' AND p.ref = '.$ref;
 		elseif ($fk_bank)
 			$sql .= ' AND p.fk_bank = '.$fk_bank;
 		//print $sql;
diff --git a/htdocs/fourn/facture/list.php b/htdocs/fourn/facture/list.php
index 317def67098..792fb91f980 100644
--- a/htdocs/fourn/facture/list.php
+++ b/htdocs/fourn/facture/list.php
@@ -419,6 +419,10 @@ if ($search_user > 0)
 	$sql .= ", ".MAIN_DB_PREFIX."element_contact as ec";
 	$sql .= ", ".MAIN_DB_PREFIX."c_type_contact as tc";
 }
+// Add table from hooks
+$parameters = array();
+$reshook = $hookmanager->executeHooks('printFieldListFrom', $parameters, $object); // Note that $action and $object may have been modified by hook
+$sql .= $hookmanager->resPrint;
 $sql .= ' WHERE f.fk_soc = s.rowid';
 $sql .= ' AND f.entity IN ('.getEntity('facture_fourn').')';
 if (!$user->rights->societe->client->voir && !$socid) $sql .= " AND s.rowid = sc.fk_soc AND sc.fk_user = ".$user->id;
@@ -512,10 +516,19 @@ if (!$search_all)
 			$sql .= ($extrafields->attributes[$object->table_element]['type'][$key] != 'separate' ? ",ef.".$key : '');
 		}
 	}
+	// Add GroupBy from hooks
+	$parameters = array('all' => $all, 'fieldstosearchall' => $fieldstosearchall);
+	$reshook = $hookmanager->executeHooks('printFieldListGroupBy', $parameters, $object); // Note that $action and $object may have been modified by hook
+	$sql .= $hookmanager->resPrint;
 } else {
 	$sql .= natural_search(array_keys($fieldstosearchall), $search_all);
 }
 
+// Add HAVING from hooks
+$parameters = array();
+$reshook = $hookmanager->executeHooks('printFieldListHaving', $parameters, $object); // Note that $action and $object may have been modified by hook
+$sql .= !empty($hookmanager->resPrint) ? (' HAVING 1=1 ' . $hookmanager->resPrint) : '';
+
 $sql .= $db->order($sortfield, $sortorder);
 
 $nbtotalofrecords = '';
@@ -594,6 +607,10 @@ if ($resql)
 
 	// Add $param from extra fields
 	include DOL_DOCUMENT_ROOT.'/core/tpl/extrafields_list_search_param.tpl.php';
+	// Add $param from hooks
+	$parameters = array();
+	$reshook = $hookmanager->executeHooks('printFieldListSearchParam', $parameters, $object); // Note that $action and $object may have been modified by hook
+	$param .= $hookmanager->resPrint;
 
 	// List of mass actions available
 	$arrayofmassactions = array(
diff --git a/htdocs/public/ticket/list.php b/htdocs/public/ticket/list.php
index 0f9542c986a..4c426869239 100644
--- a/htdocs/public/ticket/list.php
+++ b/htdocs/public/ticket/list.php
@@ -51,7 +51,7 @@ $langs->loadLangs(array("companies", "other", "ticket"));
 // Get parameters
 $track_id = GETPOST('track_id', 'alpha');
 $action = GETPOST('action', 'aZ09');
-$email = GETPOST('email', 'alpha');
+$email = strtolower(GETPOST('email', 'alpha'));
 
 if (GETPOST('btn_view_ticket_list')) {
 	unset($_SESSION['track_id_customer']);
@@ -61,7 +61,7 @@ if (isset($_SESSION['track_id_customer'])) {
 	$track_id = $_SESSION['track_id_customer'];
 }
 if (isset($_SESSION['email_customer'])) {
-	$email = $_SESSION['email_customer'];
+	$email = strtolower($_SESSION['email_customer']);
 }
 
 $object = new Ticket($db);
@@ -101,7 +101,7 @@ if ($action == "view_ticketlist") {
 			// vérifie si l'adresse email est bien dans les contacts du ticket
 			$contacts = $object->liste_contact(-1, 'external');
 			foreach ($contacts as $contact) {
-				if ($contact['email'] == $email) {
+				if (strtolower($contact['email']) == $email) {
 					$display_ticket_list = true;
 					$_SESSION['email_customer'] = $email;
 					$_SESSION['track_id_customer'] = $track_id;
@@ -112,7 +112,7 @@ if ($action == "view_ticketlist") {
 			}
 			if ($object->fk_soc > 0) {
 				$object->fetch_thirdparty();
-				if ($email == $object->thirdparty->email) {
+				if ($email == strtolower($object->thirdparty->email)) {
 					$display_ticket_list = true;
 					$_SESSION['email_customer'] = $email;
 					$_SESSION['track_id_customer'] = $track_id;
@@ -121,14 +121,14 @@ if ($action == "view_ticketlist") {
 			if ($object->fk_user_create > 0) {
 				$tmpuser = new User($db);
 				$tmpuser->fetch($object->fk_user_create);
-				if ($email == $tmpuser->email) {
+				if ($email == strtolower($tmpuser->email)) {
 					$display_ticket_list = true;
 					$_SESSION['email_customer'] = $email;
 					$_SESSION['track_id_customer'] = $track_id;
 				}
 			}
 
-			$emailorigin = CMailFile::getValidAddress($object->origin_email, 2);
+			$emailorigin = strtolower(CMailFile::getValidAddress($object->origin_email, 2));
 			if ($email == $emailorigin) {
 				$display_ticket_list = true;
 				$_SESSION['email_customer'] = $email;
diff --git a/htdocs/public/ticket/view.php b/htdocs/public/ticket/view.php
index 02c7c9e51d8..cde872c56db 100644
--- a/htdocs/public/ticket/view.php
+++ b/htdocs/public/ticket/view.php
@@ -53,13 +53,13 @@ $langs->loadLangs(array("companies", "other", "ticket"));
 $track_id = GETPOST('track_id', 'alpha');
 $cancel   = GETPOST('cancel', 'alpha');
 $action   = GETPOST('action', 'aZ09');
-$email    = GETPOST('email', 'alpha');
+$email    = strtolower(GETPOST('email', 'alpha'));
 
 if (GETPOST('btn_view_ticket')) {
 	unset($_SESSION['email_customer']);
 }
 if (isset($_SESSION['email_customer'])) {
-	$email = $_SESSION['email_customer'];
+	$email = strtolower($_SESSION['email_customer']);
 }
 
 $object = new ActionsTicket($db);
@@ -103,7 +103,7 @@ if ($action == "view_ticket" || $action == "presend" || $action == "close" || $a
 		$ret = $object->fetch('', '', $track_id);
 		if ($ret && $object->dao->id > 0) {
 			// Check if emails provided is the one of author
-			$emailofticket = CMailFile::getValidAddress($object->dao->origin_email, 2);
+			$emailofticket = strtolower(CMailFile::getValidAddress($object->dao->origin_email, 2));
 			if ($emailofticket == $email)
 			{
 				$display_ticket = true;
@@ -113,7 +113,7 @@ if ($action == "view_ticket" || $action == "presend" || $action == "close" || $a
 			else {
 				$contacts = $object->dao->liste_contact(-1, 'external');
 				foreach ($contacts as $contact) {
-					if ($contact['email'] == $email) {
+					if (strtolower($contact['email']) == $email) {
 						$display_ticket = true;
 						$_SESSION['email_customer'] = $email;
 						break;
@@ -135,7 +135,7 @@ if ($action == "view_ticket" || $action == "presend" || $action == "close" || $a
 			{
 				$tmpuser = new User($db);
 				$tmpuser->fetch($object->dao->fk_user_create);
-				if ($email == $tmpuser->email) {
+				if ($email == strtolower($tmpuser->email)) {
 					$display_ticket = true;
 					$_SESSION['email_customer'] = $email;
 				}
@@ -145,7 +145,7 @@ if ($action == "view_ticket" || $action == "presend" || $action == "close" || $a
 			{
 				$tmpuser = new User($db);
 				$tmpuser->fetch($object->dao->fk_user_assign);
-				if ($email == $tmpuser->email) {
+				if ($email == strtolower($tmpuser->email)) {
 					$display_ticket = true;
 					$_SESSION['email_customer'] = $email;
 				}
diff --git a/htdocs/website/class/website.class.php b/htdocs/website/class/website.class.php
index d0ffc3ccc03..966e0e8e4d8 100644
--- a/htdocs/website/class/website.class.php
+++ b/htdocs/website/class/website.class.php
@@ -184,6 +184,11 @@ class Website extends CommonObject
 		$tmparray = explode(',', $this->otherlang);
 		if (is_array($tmparray)) {
 			foreach ($tmparray as $key => $val) {
+				// It possible we have empty val here if postparam WEBSITE_OTHERLANG is empty or set like this : 'en,,sv' or 'en,sv,'
+				if (empty(trim($val))) {
+					unset($tmparray[$key]);
+					continue;
+				}
 				$tmparray[$key] = preg_replace('/[_-].*$/', '', trim($val)); // en_US or en-US -> en
 			}
 			$this->otherlang = join(',', $tmparray);
@@ -494,6 +499,11 @@ class Website extends CommonObject
 		$tmparray = explode(',', $this->otherlang);
 		if (is_array($tmparray)) {
 			foreach ($tmparray as $key => $val) {
+				// It possible we have empty val here if postparam WEBSITE_OTHERLANG is empty or set like this : 'en,,sv' or 'en,sv,'
+				if (empty(trim($val))) {
+					unset($tmparray[$key]);
+					continue;
+				}
 				$tmparray[$key] = preg_replace('/[_-].*$/', '', trim($val)); // en_US or en-US -> en
 			}
 			$this->otherlang = join(',', $tmparray);
diff --git a/htdocs/website/index.php b/htdocs/website/index.php
index ebcf31ad2c5..03ce856c2a1 100644
--- a/htdocs/website/index.php
+++ b/htdocs/website/index.php
@@ -551,6 +551,8 @@ if ($action == 'addsite')
 	{
 		$arrayotherlang = explode(',', GETPOST('WEBSITE_OTHERLANG', 'alphanohtml'));
 		foreach ($arrayotherlang as $key => $val) {
+			// It possible we have empty val here if postparam WEBSITE_OTHERLANG is empty or set like this : 'en,,sv' or 'en,sv,'
+			if (empty(trim($val))) continue;
 			$arrayotherlang[$key] = substr(trim($val), 0, 2); // Kept short language code only
 		}
 
@@ -1327,6 +1329,8 @@ if ($action == 'updatecss')
 			{
 				$arrayotherlang = explode(',', GETPOST('WEBSITE_OTHERLANG', 'alphanohtml'));
 				foreach ($arrayotherlang as $key => $val) {
+					// It possible we have empty val here if postparam WEBSITE_OTHERLANG is empty or set like this : 'en,,sv' or 'en,sv,'
+					if (empty(trim($val))) continue;
 					$arrayotherlang[$key] = substr(trim($val), 0, 2); // Kept short language code only
 				}
 
@@ -1768,6 +1772,10 @@ if ($action == 'updatemeta')
 				$filename = basename($fileoldalias);
 				$sublangs = explode(',', $object->otherlang);
 				foreach ($sublangs as $sublang) {
+					// Under certain conditions $sublang can be an empty string
+					// ($object->otherlang with empty string or with string like this 'en,,sv')
+					// if is the case we try to re-delete the main alias file. Avoid it.
+					if (empty(trim($sublang))) continue;
 					$fileoldaliassub = $dirname.'/'.$sublang.'/'.$filename;
 					dol_delete_file($fileoldaliassub);
 				}
@@ -1790,6 +1798,10 @@ if ($action == 'updatemeta')
 						$filename = basename($pathofwebsite.'/'.trim($tmpaliasalt).'.php');
 						$sublangs = explode(',', $object->otherlang);
 						foreach ($sublangs as $sublang) {
+							// Under certain conditions $ sublang can be an empty string
+							// ($object->otherlang with empty string or with string like this 'en,,sv')
+							// if is the case we try to re-delete the main alias file. Avoid it.
+							if (empty(trim($sublang))) continue;
 							$fileoldaliassub = $dirname.'/'.$sublang.'/'.$filename;
 							dol_delete_file($fileoldaliassub);
 						}
@@ -2710,6 +2722,7 @@ if (!GETPOST('hide_websitemenu'))
 							$onlylang[$website->lang] = $website->lang.' ('.$langs->trans("Default").')';
 						}
 						foreach (explode(',', $website->otherlang) as $langkey) {
+							if (empty(trim($langkey))) continue;
 							$onlylang[$langkey] = $langkey;
 						}
 						$textifempty = $langs->trans("Default");