why I get this error

friends.c:180:17: error: ‘pic_line’ may be used uninitialized [-Werror=maybe-uninitialized]
  180 |                 printf("%s\n", pic_line);
FILE *profile_pic = fopen(user->profile_pic, "r");
        if (!(profile_pic == NULL)) {
            char *pic_line;
            while (fgets(pic_line, 100, profile_pic) != NULL) {
                printf("%s\n", pic_line);
            }
        }