diff --git a/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/RESTServer.pm b/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/RESTServer.pm
index 7a83ff69e..70655ab22 100644
--- a/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/RESTServer.pm
+++ b/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/RESTServer.pm
@@ -71,17 +71,9 @@ sub getConfByNum {
     unless ( %{ $self->currentConf }
         and $cfgNum == $self->currentConf->{cfgNum} )
     {
-        my $tmp;
-        if ( $cfgNum == 0 ) {
-            require Lemonldap::NG::Manager::Conf::Zero;
-            $tmp = Lemonldap::NG::Manager::Conf::Zero::zeroConf();
-        }
-        else {
-            $tmp =
-              $self->confAcc->getConf(
-                { cfgNum => $cfgNum, raw => 1, noCache => 1, @args } );
-            return undef unless ( $tmp and ref($tmp) and %$tmp );
-        }
+        my $tmp = $self->confAcc->getConf(
+            { cfgNum => $cfgNum, raw => 1, noCache => 1, @args } );
+        return undef unless ( $tmp and ref($tmp) and %$tmp );
         $self->currentConf($tmp);
     }
     return $cfgNum;
diff --git a/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Conf.pm b/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Conf.pm
index 006493a5d..b1fccefc4 100644
--- a/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Conf.pm
+++ b/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Conf.pm
@@ -146,12 +146,32 @@ sub prx {
 # IV. Upload methods #
 ######################
 
-# In this section, 3 methods:
+# In this section, 4 methods:
+#  - getConfByNum: override SUPER method to be able to use Zero
 #  - newConf()
 #  - newRawConf(): restore a saved conf
 #  - applyConf(): called by the 2 previous to prevent other servers that a new
 #                 configuration is available
 
+sub getConfByNum {
+    my ( $self, $cfgNum, @args ) = @_;
+    unless ( %{ $self->currentConf }
+        and $cfgNum == $self->currentConf->{cfgNum} )
+    {
+        my $tmp;
+        if ( $cfgNum == 0 ) {
+            require Lemonldap::NG::Manager::Conf::Zero;
+            $tmp = Lemonldap::NG::Manager::Conf::Zero::zeroConf();
+            $self->currentConf($tmp);
+        }
+        else {
+            $tmp = $self->SUPER::getConfByNum( $cfgNum, @args );
+            return undef unless (defined $tmp);
+        }
+    }
+    return $cfgNum;
+}
+
 ## @method PSGI-JSON-response newConf($req)
 # Call Lemonldap::NG::Manager::Conf::Parser to parse new configuration and store
 # it