diff --git a/scrapinglib/api.py b/scrapinglib/api.py
index d520e78..0a9c7fe 100644
--- a/scrapinglib/api.py
+++ b/scrapinglib/api.py
@@ -182,14 +182,17 @@ class Scraping:
             while other_sources:
             # If cover not found in other source, then skip using other sources using javdb cover instead
                 try:
-                    json_data_other = self.searchAdult(number, other_sources)
-                    if json_data_other is not None and json_data_other['cover'] != '':
-                        json_data['cover'] = json_data_other['cover']
+                    other_json_data = self.searchAdult(number, other_sources)
+                    if other_json_data is not None and 'cover' in other_json_data and other_json_data['cover'] != '':
+                        json_data['cover'] = other_json_data['cover']
                         if self.debug:
-                            print(f"[+]Find movie [{number}] cover on website '{json_data_other['cover']}'")
+                            print(f"[+]Find movie [{number}] cover on website '{other_json_data['cover']}'")
+                        break
+                    # 当不知道source为何时，只能停止搜索
+                    if 'source' not in other_json_data:
                         break
                     # check other sources
-                    other_sources = sources[sources.index(json_data_other['source']) + 1:]
+                    other_sources = sources[sources.index(other_json_data['source']) + 1:]
                 except:
                     pass