sha1_to_hex(ce->sha1), ce_stage(ce), ce->name);
        }
        printf("replacements:");
-       ewah_each_bit(si->replace_bitmap, show_bit, NULL);
+       if (si->replace_bitmap)
+               ewah_each_bit(si->replace_bitmap, show_bit, NULL);
        printf("\ndeletions:");
-       ewah_each_bit(si->delete_bitmap, show_bit, NULL);
+       if (si->delete_bitmap)
+               ewah_each_bit(si->delete_bitmap, show_bit, NULL);
        printf("\n");
        return 0;
 }