--- rpl/src/instructions_d5.c	2010/04/28 06:41:06	1.13
+++ rpl/src/instructions_d5.c	2010/04/28 07:05:38	1.14
@@ -1876,11 +1876,14 @@ instruction_detach(struct_processus *s_e
 				}
 				else
 				{
-					if (evaluation(s_etat_processus,
-							(*s_etat_processus).at_exit, 'E') == d_erreur)
+					if ((*s_etat_processus).at_exit != NULL)
 					{
-						(*s_etat_processus).erreur_execution =
-								d_ex_erreur_evaluation;
+						if (evaluation(s_etat_processus,
+								(*s_etat_processus).at_exit, 'E') == d_erreur)
+						{
+							(*s_etat_processus).erreur_execution =
+									d_ex_erreur_evaluation;
+						}
 					}
 				}