diff --git a/nhentai/cmdline.py b/nhentai/cmdline.py
index 0b5a421..e07467f 100644
--- a/nhentai/cmdline.py
+++ b/nhentai/cmdline.py
@@ -71,9 +71,9 @@ def cmd_parser():
                       help='all search results')
     parser.add_option('--page', '--page-range', type='string', dest='page', action='store', default='',
                       help='page number of search results. e.g. 1,2-5,14')
-    parser.add_option('--sorting', dest='sorting', action='store', default='recent',
+    parser.add_option('--sorting', dest='sorting', action='store', default='date',
                       help='sorting of doujinshi (recent / popular / popular-[today|week])',
-                      choices=['recent', 'popular', 'popular-today', 'popular-week'])
+                      choices=['recent', 'popular', 'popular-today', 'popular-week', 'date'])
 
     # download options
     parser.add_option('--output', '-o', type='string', dest='output_dir', action='store', default='./',
@@ -112,7 +112,7 @@ def cmd_parser():
     # nhentai options
     parser.add_option('--cookie', type='str', dest='cookie', action='store',
                       help='set cookie of nhentai to bypass Cloudflare captcha')
-    parser.add_option('--useragent', type='str', dest='useragent', action='store',
+    parser.add_option('--useragent', '--user-agent', type='str', dest='useragent', action='store',
                       help='set useragent to bypass Cloudflare captcha')
     parser.add_option('--language', type='str', dest='language', action='store',
                       help='set default language to parse doujinshis')
@@ -158,7 +158,7 @@ def cmd_parser():
     elif args.useragent is not None:
         constant.CONFIG['useragent'] = args.useragent
         write_config()
-        logger.info('Useragent saved.')
+        logger.info('User-Agent saved.')
         exit(0)
     elif args.language is not None:
         constant.CONFIG['language'] = args.language
diff --git a/nhentai/parser.py b/nhentai/parser.py
index 4562d3e..2e7a29a 100644
--- a/nhentai/parser.py
+++ b/nhentai/parser.py
@@ -200,6 +200,7 @@ def print_doujinshi(doujinshi_list):
 def search_parser(keyword, sorting, page, is_page_all=False):
     # keyword = '+'.join([i.strip().replace(' ', '-').lower() for i in keyword.split(',')])
     result = []
+    response = None
     if not page:
         page = [1]
 
@@ -217,13 +218,14 @@ def search_parser(keyword, sorting, page, is_page_all=False):
             try:
                 url = request('get', url=constant.SEARCH_URL, params={'query': keyword,
                                                                       'page': p, 'sort': sorting}).url
+                print(url)
                 response = request('get', url.replace('%2B', '+')).json()
             except Exception as e:
                 logger.critical(str(e))
-
+                response = None
             break
 
-        if 'result' not in response:
+        if response is None or 'result' not in response:
             logger.warning('No result in response in page {}'.format(p))
             break