diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 273e4c834db..6d8fb1a4b7a 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -9024,7 +9024,8 @@ function setEventMessage($mesgs, $style = 'mesgs', $noduplicate = 0)
 {
 	//dol_syslog(__FUNCTION__ . " is deprecated", LOG_WARNING);		This is not deprecated, it is used by setEventMessages function
 	if (!is_array($mesgs)) {
-		// If mesgs is a string
+		$mesgs = trim((string) $mesgs);
+		// If mesgs is a not an empty string
 		if ($mesgs) {
 			if (!empty($noduplicate) && isset($_SESSION['dol_events'][$style]) && in_array($mesgs, $_SESSION['dol_events'][$style])) {
 				return;
@@ -9034,6 +9035,7 @@ function setEventMessage($mesgs, $style = 'mesgs', $noduplicate = 0)
 	} else {
 		// If mesgs is an array
 		foreach ($mesgs as $mesg) {
+			$mesg = trim((string) $mesg);
 			if ($mesg) {
 				if (!empty($noduplicate) && isset($_SESSION['dol_events'][$style]) && in_array($mesg, $_SESSION['dol_events'][$style])) {
 					return;