Prevent possible null-dereference

diff --git a/util/ego/bo/bo.c b/util/ego/bo/bo.c
index 64892c7..1951ac6 100644 (file)
--- a/util/ego/bo/bo.c
+++ b/util/ego/bo/bo.c
@@ -71,7 +71,7 @@ STATIC line_p last_code(lines,skip_pseu)
 
        for (l = lines; l->l_next != (line_p) 0; l = l->l_next);
        if (skip_pseu) {
-               while (INSTR(l) < sp_fmnem || INSTR(l) > sp_lmnem) l = PREV(l);
+               while (l && (INSTR(l) < sp_fmnem || INSTR(l) > sp_lmnem)) l = PREV(l);
        }
        return l;
 }