diff --git a/src/invidious/routes/api/v1/authentication.cr b/src/invidious/routes/api/v1/authentication.cr
index fc407181..e452475c 100644
--- a/src/invidious/routes/api/v1/authentication.cr
+++ b/src/invidious/routes/api/v1/authentication.cr
@@ -10,7 +10,7 @@ module Invidious::Routes::API::V1::Authentication
       creds = nil
       begin
         creds = Credentials.from_json(body_json)
-      rescue
+      rescue JSON::SerializableError
       end
       # get user info
       if creds
@@ -42,11 +42,10 @@ module Invidious::Routes::API::V1::Authentication
         # send captcha if enabled
         if CONFIG.captcha_enabled
           captcha_response = nil
-          captcha_response = CaptchaResponse.from_json(body_json)
-          # begin
-          # rescue ex
-
-          # end
+          begin
+            captcha_response = CaptchaResponse.from_json(body_json)
+          rescue JSON::SerializableError
+          end
           if captcha_response
             answer = captcha_response.answer
             tokens = captcha_response.tokens