diff --git a/paddlehub/commands/convert.py b/paddlehub/commands/convert.py
index 0ff13888c1b1105f893122a230bf093678483599..c963841a77c7e8c4bf5a42b99725e77ef69be8c7 100644
--- a/paddlehub/commands/convert.py
+++ b/paddlehub/commands/convert.py
@@ -140,6 +140,9 @@ class ConvertCommand(BaseCommand):
         self.module = args.module_name
         self.version = args.module_version if args.module_version is not None else '1.0.0'
         self.src = args.model_dir
+        if not os.path.isdir(self.src):
+            print('`{}` is not exists or not a directory path'.format(self.src))
+            return False
         self.dest = args.output_dir if args.output_dir is not None else os.path.join(
             '{}_{}'.format(self.module, str(time.time())))
 
diff --git a/paddlehub/common/hub_server.py b/paddlehub/common/hub_server.py
index f7c27ce7f179da47497a0d0b8215f2d810523c7c..1ae2496db0984be7743eec9af39a62201cc6bbba 100644
--- a/paddlehub/common/hub_server.py
+++ b/paddlehub/common/hub_server.py
@@ -250,9 +250,15 @@ class HubServer(object):
         if not os.path.exists(CACHE_HOME):
             utils.mkdir(CACHE_HOME)
         try:
-            r = requests.get(self.get_server_url() + '/' + 'search')
-            data = json.loads(r.text)
             cache_path = os.path.join(CACHE_HOME, RESOURCE_LIST_FILE)
+            if os.path.exists(cache_path):
+                r = requests.get(
+                    self.get_server_url() + '/' + 'search', timeout=0.5)
+            else:
+                r = requests.get(
+                    self.get_server_url() + '/' + 'search', timeout=8)
+            data = json.loads(r.text)
+
             with open(cache_path, 'w+') as fp:
                 yaml.safe_dump({'resource_list': data['data']}, fp)
             return True
diff --git a/paddlehub/version.py b/paddlehub/version.py
index 37817839cb85e7bbf74b466675db24d9fef2580a..b250a1f8fcbc30a5bafd9b82b54a22951086688c 100644
--- a/paddlehub/version.py
+++ b/paddlehub/version.py
@@ -13,5 +13,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """ PaddleHub version string """
-hub_version = "1.8.1"
+hub_version = "1.8.3"
 module_proto_version = "1.0.0"