--- rpl/src/instructions_u2.c	2013/03/21 14:48:17	1.2
+++ rpl/src/instructions_u2.c	2013/03/23 16:14:39	1.3
@@ -92,6 +92,14 @@ instruction_uncompress(struct_processus
 	{
 		l_element_courant = (*s_objet_argument).objet;
 
+		if (l_element_courant == NULL)
+		{
+			liberation(s_etat_processus, s_objet_argument);
+
+			(*s_etat_processus).erreur_execution = d_ex_argument_invalide;
+			 return;
+		}
+
 		if ((*(*l_element_courant).donnee).type != INT)
 		{
 			liberation(s_etat_processus, s_objet_argument);