diff --git a/lib/dingtalk/api/base.rb b/lib/dingtalk/api/base.rb
index 7e854c0..3e01421 100644
--- a/lib/dingtalk/api/base.rb
+++ b/lib/dingtalk/api/base.rb
@@ -12,7 +12,7 @@ module Dingtalk
       end
 
       def access_token
-        redis.get("#{corp_id}_#{ACCESS_TOKEN}") || set_access_token
+        redis.get("#{corp_id}_#{ACCESS_TOKEN}").to_s.empty? || set_access_token
       end
 
       def set_access_token
@@ -20,7 +20,7 @@ module Dingtalk
       end
 
       def js_ticket
-        redis.get("#{corp_id}_#{JS_TICKET}") || set_js_ticket
+        redis.get("#{corp_id}_#{JS_TICKET}").to_s.empty? || set_js_ticket
       end
 
       def set_js_ticket
diff --git a/lib/dingtalk/api/suite.rb b/lib/dingtalk/api/suite.rb
index 313825d..3409ef7 100644
--- a/lib/dingtalk/api/suite.rb
+++ b/lib/dingtalk/api/suite.rb
@@ -18,7 +18,7 @@ module Dingtalk
       end
 
       def suite_access_token
-        redis.get(SUITE_ACCESS_TOKEN) || set_suite_access_token
+        redis.get(SUITE_ACCESS_TOKEN).to_s.empty? || set_suite_access_token
       end
 
       def set_suite_access_token
--
libgit2 0.21.0