diff --git a/unipoly-mlmmj-ldap-sync b/unipoly-mlmmj-ldap-sync
index 37767a1..d3f8d5c 100755
--- a/unipoly-mlmmj-ldap-sync
+++ b/unipoly-mlmmj-ldap-sync
@@ -156,7 +156,7 @@ def main
 
     filter = Net::LDAP::Filter.eq('cn', list_name)
     matched_ldap_groups = conn.search(base: basetree, filter: filter)
-    if matched_ldap_groups.empty?
+    if matched_ldap_groups.nil? || matched_ldap_groups.empty?
       # Could not find matching LDAP group
       puts 'NOT FOUND'
     else