lib/instana/activators/action_mailer.rb in instana-1.204.0.pre1 vs lib/instana/activators/action_mailer.rb in instana-1.204.0.pre2

@@ -3,10 +3,10 @@
 
 module Instana
   module Activators
     class ActionMailer < Activator
       def can_instrument?
-        defined?(::ActionMailer::Base)
+        defined?(::ActionMailer::Base) && defined?(ActiveSupport::Executor)
       end
 
       def instrument
         require 'instana/instrumentation/action_mailer'