updated logic

tasks/server_type.yml

diff --git a/tasks/server_type.yml b/tasks/server_type.yml
index 761c791..05bf42b 100644
--- a/tasks/server_type.yml
+++ b/tasks/server_type.yml
@@ -12,4 +12,5 @@
 
 - name: Server self attributes report
   debug:
-    msg: "{{ hostvars[inventory_hostname][self_report_name] }}"
\ No newline at end of file
+    msg: "{{ hostvars[inventory_hostname][self_report_name] }}"
+  when: "{{ self_report_name }} is defined"
\ No newline at end of file