Вызовать функцию члена getClientoriginalName () на null
<!-- use enctype -->
<form action="/route" method="POST" enctype="multipart/form-data">
JérômeW
<!-- use enctype -->
<form action="/route" method="POST" enctype="multipart/form-data"><form action="yout path" method="post" enctype="multipart/form-data">