diff --git a/Pod/Classes/Networking/SKClient.m b/Pod/Classes/Networking/SKClient.m
index f4a83cb..c43a067 100644
--- a/Pod/Classes/Networking/SKClient.m
+++ b/Pod/Classes/Networking/SKClient.m
@@ -397,7 +397,9 @@ - (void)signInWithUsername:(NSString *)username password:(NSString *)password co
                 }];
             }] resume];
         } else {
-            completion(nil, error);
+            dispatch_async(dispatch_get_main_queue(), ^{
+                completion(nil, error);
+            });
         }
     }];
 }