diff --git a/templates/clients.tpl b/templates/clients.tpl
index 306b044..f0b037b 100644
--- a/templates/clients.tpl
+++ b/templates/clients.tpl
@@ -14,7 +14,10 @@
                         <?php continue; ?>
                     {/if}
 					{if $key == 'siret'}
-						<?php $value = implode(' ', str_split($value, 3)); ?>
+						<?php 
+							if (null === $value) { $value = ""; }
+							$value = implode(' ', str_split($value, 3));
+						?>
 					{/if}
                     <td>{$value}</td>
                 {/foreach}