diff --git a/Api/AniSyncController.cs b/Api/AniSyncController.cs
index 62b3fc8..93a68ac 100644
--- a/Api/AniSyncController.cs
+++ b/Api/AniSyncController.cs
@@ -114,6 +114,8 @@ public async Task<IActionResult> PasswordGrantAuthentication(ApiName provider, s
                     if (userConfig != null) {
                         KitsuApiCalls kitsuApiCalls = new KitsuApiCalls(_httpClientFactory, _loggerFactory, _serverApplicationHost, _httpContextAccessor, _memoryCache, _delayer, userConfig);
                         var kitsuUserConfig = await kitsuApiCalls.GetUserInformation();
+                        if (kitsuUserConfig == null)
+                            return StatusCode(500, "Could not authenticate");
                         var existingKeyPair = userConfig.KeyPairs.FirstOrDefault(item => item.Key == "KitsuUserId");
                         if (existingKeyPair != null) {
                             existingKeyPair.Value = kitsuUserConfig.Id.ToString();