diff --git a/sentry-rails/lib/sentry/rails/breadcrumb/active_support_logger.rb b/sentry-rails/lib/sentry/rails/breadcrumb/active_support_logger.rb
index 6ba0f6e28..c3eb90dee 100644
--- a/sentry-rails/lib/sentry/rails/breadcrumb/active_support_logger.rb
+++ b/sentry-rails/lib/sentry/rails/breadcrumb/active_support_logger.rb
@@ -14,7 +14,10 @@ def add(name, started, _finished, _unique_id, data)
 
           def inject
             @subscriber = ::ActiveSupport::Notifications.subscribe(/.*/) do |name, started, finished, unique_id, data|
-              add(name, started, finished, unique_id, data)
+              # we only record events that has a started timestamp
+              if started.is_a?(Time)
+                add(name, started, finished, unique_id, data)
+              end
             end
           end
 
diff --git a/sentry-rails/spec/sentry/rails/active_support_breadcrumbs_spec.rb b/sentry-rails/spec/sentry/rails/active_support_breadcrumbs_spec.rb
index 7fc80f1c3..947996c0f 100644
--- a/sentry-rails/spec/sentry/rails/active_support_breadcrumbs_spec.rb
+++ b/sentry-rails/spec/sentry/rails/active_support_breadcrumbs_spec.rb
@@ -17,11 +17,19 @@
     Sentry.get_current_scope.clear_breadcrumbs
   end
 
+  let(:transport) do
+    Sentry.get_current_client.transport
+  end
+
+  after do
+    transport.events = []
+  end
+
   it "captures correct data" do
     get "/exception"
 
     expect(response.status).to eq(500)
-    event = Sentry.get_current_client.transport.events.first.to_json_compatible
+    event = transport.events.first.to_json_compatible
     breadcrumbs = event.dig("breadcrumbs", "values")
     expect(breadcrumbs.count).to eq(2)
 
@@ -55,4 +63,12 @@
       )
     end
   end
+
+  it "ignores events that doesn't have a started timestamp" do
+    expect do
+      ActiveSupport::Notifications.publish "foo", Object.new
+    end.not_to raise_error
+
+    expect(transport.events).to be_empty
+  end
 end