Fix error during migration

htdocs/core/modules/modDeplacement.class.php

@@ -135,10 +135,13 @@ class modDeplacement extends DolibarrModules
 		$this->export_sql_end[$r] .=' AND d.entity IN ('.getEntity('deplacement',1).')';
 		if (empty($user->rights->societe->client->voir)) $this->export_sql_end[$r] .=' AND (sc.fk_user = '.(empty($user)?0:$user->id).' OR d.fk_soc IS NULL)';
 		
-		$childids = $user->getAllChildIds();
-		$childids[]=$user->id;
-		
-		if (empty($user->rights->deplacement->readall) && empty($user->rights->deplacement->lire_tous)) $sql.=' AND d.fk_user IN ('.join(',',$childids).')';
+		if (! empty($user))   // Not defined during migration process
+		{
+    		$childids = $user->getAllChildIds();
+    		$childids[]=$user->id;
+    		
+    		if (empty($user->rights->deplacement->readall) && empty($user->rights->deplacement->lire_tous)) $sql.=' AND d.fk_user IN ('.join(',',$childids).')';
+		}
 	}