diff --git a/src/vmm_mad/remotes/lib/vcenter_driver/datacenter.rb b/src/vmm_mad/remotes/lib/vcenter_driver/datacenter.rb
index 31e66c9df2..cfc9180415 100644
--- a/src/vmm_mad/remotes/lib/vcenter_driver/datacenter.rb
+++ b/src/vmm_mad/remotes/lib/vcenter_driver/datacenter.rb
@@ -557,7 +557,14 @@ class DatacenterFolder
         networks = {}
 
         # Selected host in OpenNebula
-        one_client = OpenNebula::Client.new(nil, $conf[:one_xmlrpc])
+        if $conf.nil?
+            one_client = OpenNebula::Client.new
+        else
+            one_client = OpenNebula::Client.new(
+                nil,
+                $conf[:one_xmlrpc]
+            )
+        end
 
         one_host = OpenNebula::Host.new_with_id(args[:host], one_client)
         rc = one_host.info
diff --git a/src/vmm_mad/remotes/lib/vcenter_driver/vi_helper.rb b/src/vmm_mad/remotes/lib/vcenter_driver/vi_helper.rb
index 6ad898c107..de746b1fcf 100644
--- a/src/vmm_mad/remotes/lib/vcenter_driver/vi_helper.rb
+++ b/src/vmm_mad/remotes/lib/vcenter_driver/vi_helper.rb
@@ -23,7 +23,14 @@ class VIHelper
     VM_PREFIX_DEFAULT = "one-$i-"
 
     def self.client
-        @@client ||= OpenNebula::Client.new(nil, $conf[:one_xmlrpc]) # rubocop:disable Style/ClassVars
+        if $conf.nil?
+            @@client ||= OpenNebula::Client.new # rubocop:disable Style/ClassVars
+        else
+            @@client ||= OpenNebula::Client.new(
+                nil,
+                $conf[:one_xmlrpc]
+            )
+        end
     end
 
     def self.set_client(options, client=nil)