diff --git a/htdocs/core/lib/phpsessionindb.lib.php b/htdocs/core/lib/phpsessionindb.lib.php
index 71711eb6ba6..8001b3ece60 100644
--- a/htdocs/core/lib/phpsessionindb.lib.php
+++ b/htdocs/core/lib/phpsessionindb.lib.php
@@ -117,7 +117,7 @@ function dolSessionWrite($sess_id, $val)
 			// No session found, insert a new one
 			$insert_query = "INSERT INTO ".MAIN_DB_PREFIX."session";
 			$insert_query .= "(session_id, session_variable, last_accessed, fk_user, remote_ip, user_agent)";
-			$insert_query .= " VALUES ('".$dbsession->escape($sess_id)."', '".$dbsession->escape($val)."', '".$dbsession->idate($time_stamp)."', 0, '".$dbsession->escape(getUserRemoteIP())."', '".$dbsession->escape($_SERVER['HTTP_USER_AGENT'])."')";
+			$insert_query .= " VALUES ('".$dbsession->escape($sess_id)."', '".$dbsession->escape($val)."', '".$dbsession->idate($time_stamp)."', 0, '".$dbsession->escape(getUserRemoteIP())."', '".$dbsession->escape(substr($_SERVER['HTTP_USER_AGENT'], 0, 255))."')";
 
 			$result = $dbsession->query($insert_query);
 			if (!$result) {
@@ -140,7 +140,7 @@ function dolSessionWrite($sess_id, $val)
 			// No session found, insert a new one
 			$insert_query = "INSERT INTO ".MAIN_DB_PREFIX."session";
 			$insert_query .= "(session_id, session_variable, last_accessed, fk_user, remote_ip, user_agent)";
-			$insert_query .= " VALUES ('".$dbsession->escape($sess_id)."', '".$dbsession->escape($val)."', '".$dbsession->idate($time_stamp)."', 0, '".$dbsession->escape(getUserRemoteIP())."', '".$dbsession->escape($_SERVER['HTTP_USER_AGENT'])."')";
+			$insert_query .= " VALUES ('".$dbsession->escape($sess_id)."', '".$dbsession->escape($val)."', '".$dbsession->idate($time_stamp)."', 0, '".$dbsession->escape(getUserRemoteIP())."', '".$dbsession->escape(substr($_SERVER['HTTP_USER_AGENT'], 0, 255)."')";
 			var_dump($insert_query);
 			$result = $dbsession->query($insert_query);
 			if (!$result) {
diff --git a/htdocs/install/mysql/migration/14.0.0-15.0.0.sql b/htdocs/install/mysql/migration/14.0.0-15.0.0.sql
index f3f92b39dae..5ec019cf253 100644
--- a/htdocs/install/mysql/migration/14.0.0-15.0.0.sql
+++ b/htdocs/install/mysql/migration/14.0.0-15.0.0.sql
@@ -475,3 +475,4 @@ ALTER TABLE llx_propal ADD COLUMN online_sign_name varchar(64);
 
 ALTER TABLE llx_entrepot ADD COLUMN warehouse_usage integer DEFAULT 1;
 
+ALTER TABLE llx_session MODIFY COLUMN user_agent VARCHAR(255) NULL;
diff --git a/htdocs/install/mysql/tables/llx_session.sql b/htdocs/install/mysql/tables/llx_session.sql
index 5be31733c22..c466bda72dd 100644
--- a/htdocs/install/mysql/tables/llx_session.sql
+++ b/htdocs/install/mysql/tables/llx_session.sql
@@ -24,5 +24,5 @@ create table llx_session
   last_accessed datetime NOT NULL,
   fk_user integer NOT NULL,
   remote_ip varchar(64) NULL,
-  user_agent varchar(128) NULL
+  user_agent varchar(255) NULL
 )ENGINE=innodb;