diff --git a/src/oca/ruby/opennebula/group.rb b/src/oca/ruby/opennebula/group.rb
index dac844b662..fd70886b52 100644
--- a/src/oca/ruby/opennebula/group.rb
+++ b/src/oca/ruby/opennebula/group.rb
@@ -330,6 +330,8 @@ module OpenNebula
         end
 
         def create_default_acls(resources=nil)
+            return if resources && resources.strip.empty?
+
             resources = GROUP_DEFAULT_ACLS if !resources
 
             acls = Array.new