diff --git a/app/observers/activity_observer.rb b/app/observers/activity_observer.rb
index 92aa299..477ebd7 100644
--- a/app/observers/activity_observer.rb
+++ b/app/observers/activity_observer.rb
@@ -33,7 +33,7 @@ class ActivityObserver < BaseObserver
       target_id: record.id,
       target_type: record.class.name,
       action: status,
-      author_id: current_user
+      author_id: current_user.id
     )
   end
 end
diff --git a/app/observers/merge_request_observer.rb b/app/observers/merge_request_observer.rb
index 6843f33..689a25f 100644
--- a/app/observers/merge_request_observer.rb
+++ b/app/observers/merge_request_observer.rb
@@ -46,7 +46,7 @@ class MergeRequestObserver < ActivityObserver
       target_id: record.id,
       target_type: record.class.name,
       action: status,
-      author_id: current_user
+      author_id: current_user.id
     )
   end
 end
diff --git a/spec/observers/activity_observer_spec.rb b/spec/observers/activity_observer_spec.rb
index e93c969..7883755 100644
--- a/spec/observers/activity_observer_spec.rb
+++ b/spec/observers/activity_observer_spec.rb
@@ -8,7 +8,6 @@ describe ActivityObserver do
     it { @event.project.should == project }
   end
 
-
   describe "Issue created" do
     before do
       Issue.observers.enable :activity_observer do
--
libgit2 0.21.2