diff --git a/lib/admin_command.rb b/lib/admin_command.rb
index f1e115599dec04004a66c2584be812cd723687c9..f01c4bfed49451c62d1c5a1ccab074f3b0c947f2 100644
--- a/lib/admin_command.rb
+++ b/lib/admin_command.rb
@@ -87,7 +87,7 @@ class AdminCommand
 
 		reg = @target_customer.registered?
 		vars = { notice: notice, customer_id: @target_customer.customer_id,
-		         jid: @target_customer.jid, tel: reg&.phone }
+		         jid: @target_customer.jid, tel: reg ? reg.phone : nil }
 		reply(FormTemplate.render("admin_menu", **vars)).then do |response|
 			if response.form.field("action")
 				handle(response.form.field("action").value, response.action)