diff --git a/src/PVE/API2/OpenId.pm b/src/PVE/API2/OpenId.pm
index 9080865..4fc0be8 100644
--- a/src/PVE/API2/OpenId.pm
+++ b/src/PVE/API2/OpenId.pm
@@ -98,7 +98,7 @@ __PACKAGE__->register_method ({
 	my ($param) = @_;
 
 	my $dcconf = PVE::Cluster::cfs_read_file('datacenter.cfg');
-	local $ENV{all_proxy} = $dcconf->{http_proxy};
+	local $ENV{all_proxy} = $dcconf->{http_proxy} if exists $dcconf->{http_proxy};
 
 	my $realm = extract_param($param, 'realm');
 	my $redirect_url = extract_param($param, 'redirect-url');
@@ -153,7 +153,7 @@ __PACKAGE__->register_method ({
 	my $res;
 	eval {
 	    my $dcconf = PVE::Cluster::cfs_read_file('datacenter.cfg');
-	    local $ENV{all_proxy} = $dcconf->{http_proxy};
+	    local $ENV{all_proxy} = $dcconf->{http_proxy} if exists $dcconf->{http_proxy};
 
 	    my ($realm, $private_auth_state) = PVE::RS::OpenId::verify_public_auth_state(
 		$openid_state_path, $param->{'state'});