diff --git a/ChangeLog b/ChangeLog
index 2c92340947f..f363b3fa459 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,7 @@ For users:
 - Fix: Broken feature in trips and expense module.
 - Fix: Can use $ in database and login/pass values.
 - Fix: No error on upgrade if there is orphelins tasks.
+- Fix: Failed to login when user agent string was longer than 128.
 
 
 ***** ChangeLog for 2.8 compared to 2.7 *****
diff --git a/htdocs/core/events.class.php b/htdocs/core/events.class.php
index 3aea6c07d21..34ca49b74ab 100644
--- a/htdocs/core/events.class.php
+++ b/htdocs/core/events.class.php
@@ -95,7 +95,7 @@ class Events // extends CommonObject
 		$sql.= " '".$this->type."',";
 		$sql.= " ".$conf->entity.",";
 		$sql.= " '".$_SERVER['REMOTE_ADDR']."',";
-		$sql.= " ".($_SERVER['HTTP_USER_AGENT']?"'".$_SERVER['HTTP_USER_AGENT']."'":'NULL').",";
+		$sql.= " ".($_SERVER['HTTP_USER_AGENT']?"'".dol_trunc($_SERVER['HTTP_USER_AGENT'],120)."'":'NULL').",";
 		$sql.= " ".$this->db->idate($this->dateevent).",";
 		$sql.= " ".($user->id?"'".$user->id."'":'NULL').",";
 		$sql.= " '".addslashes($this->description)."'";