foreman-tasks fix

diff --git a/app/models/foreman_tasks/concerns/action_triggering.rb b/app/models/foreman_tasks/concerns/action_triggering.rb
index 924c82a..08fe738 100644
--- a/app/models/foreman_tasks/concerns/action_triggering.rb
+++ b/app/models/foreman_tasks/concerns/action_triggering.rb
@@ -152,7 +152,7 @@ module ForemanTasks
           run = ::ForemanTasks.dynflow.world.execute(@execution_plan.id)
           if @dynflow_sync_action
             run.wait
-            if run.value.error?
+            if run.value.try(:error?)
               task = ForemanTasks::Task::DynflowTask.where(:external_id => @execution_plan.id).first!
               raise ForemanTasks::TaskError, task
             end