syntax error on the when condition

playbooks/roles/forum/tasks/deploy.yml

@@ -53,7 +53,7 @@
 - name: update supervisor configuration
   shell:  "{{ supervisor_ctl }} -c {{ supervisor_cfg }} update"
   register: supervisor_update
-  changed_when: supervisor_update.stdout is defined supervisor_update.stdout != ""
+  changed_when: supervisor_update.stdout is defined and supervisor_update.stdout != ""
   when: not disable_edx_services
 
 - name: ensure forum is started