diff --git a/htdocs/comm/action/class/actioncomm.class.php b/htdocs/comm/action/class/actioncomm.class.php
index f7e0ef6acb1..d094fb0bab4 100644
--- a/htdocs/comm/action/class/actioncomm.class.php
+++ b/htdocs/comm/action/class/actioncomm.class.php
@@ -683,6 +683,10 @@ class ActionComm extends CommonObject
 	{
 		global $langs;
 
+		if (empty($id) && empty($ref) && empty($ref_ext) && empty($email_msgid)) {
+			return -1;
+		}
+
 		$sql = "SELECT a.id,";
 		$sql .= " a.id as ref,";
 		$sql .= " a.entity,";
diff --git a/htdocs/projet/class/project.class.php b/htdocs/projet/class/project.class.php
index 54e0f87a358..c5dd1045f03 100644
--- a/htdocs/projet/class/project.class.php
+++ b/htdocs/projet/class/project.class.php
@@ -526,7 +526,9 @@ class Project extends CommonObject
 	{
 		global $conf;
 
-		if (empty($id) && empty($ref)) return -1;
+		if (empty($id) && empty($ref) && empty($ref_ext) && empty($email_msgid)) {
+			return -1;
+		}
 
 		$sql = "SELECT rowid, entity, ref, title, description, public, datec, opp_amount, budget_amount,";
 		$sql .= " tms, dateo, datee, date_close, fk_soc, fk_user_creat, fk_user_modif, fk_user_close, fk_statut as status, fk_opp_status, opp_percent,";
diff --git a/htdocs/ticket/class/ticket.class.php b/htdocs/ticket/class/ticket.class.php
index 5f95c7f0dc5..20d63cea600 100644
--- a/htdocs/ticket/class/ticket.class.php
+++ b/htdocs/ticket/class/ticket.class.php
@@ -529,7 +529,7 @@ class Ticket extends CommonObject
 		global $langs;
 
 		// Check parameters
-		if (!$id && !$track_id && !$ref && !$email_msgid) {
+		if (empty($id) && empty($ref) && empty($track_id) && empty($email_msgid)) {
 			$this->error = 'ErrorWrongParameters';
 			dol_print_error(get_class($this)."::fetch ".$this->error);
 			return -1;