diff --git a/ext/posix/posix.c b/ext/posix/posix.c
index 8578056b28da..655c522a89af 100644
--- a/ext/posix/posix.c
+++ b/ext/posix/posix.c
@@ -669,7 +669,11 @@ int php_posix_group_to_array(struct group *g, zval *array_group) /* {{{ */
 
 	array_init(&array_members);
 
-	add_assoc_string(array_group, "name", g->gr_name);
+	if (g->gr_name) {
+		add_assoc_string(array_group, "name", g->gr_name);
+	} else {
+		add_assoc_null(array_group, "name");
+	}
 	if (g->gr_passwd) {
 		add_assoc_string(array_group, "passwd", g->gr_passwd);
 	} else {