diff --git a/tasks/main.yml b/tasks/main.yml
index d522eed98dce07ec04f969cfe2aade9312537762..14dc7da13f1babf115853e550af943f5eab624f1 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -5,6 +5,7 @@
   assert:
     that:
         - ansible_os_family == 'Debian'
+        - ansible_lsb is mapping
         - ansible_lsb.codename in ['buster', 'jessie', 'sid', 'stretch', 'trusty', 'xenial', 'yakkety', 'zesty']
         - nodejs_version in [6, 8]