diff --git a/lib/web/New-IcingaSSLStream.psm1 b/lib/web/New-IcingaSSLStream.psm1
index 6ffc693..556ac12 100644
--- a/lib/web/New-IcingaSSLStream.psm1
+++ b/lib/web/New-IcingaSSLStream.psm1
@@ -1,10 +1,14 @@
 function New-IcingaSSLStream()
 {
     param(
-        [System.Net.Sockets.TcpClient]$Client                                 = @{},
+        [System.Net.Sockets.TcpClient]$Client                                 = $null,
         [Security.Cryptography.X509Certificates.X509Certificate2]$Certificate = $null
     );
 
+    if ($null -eq $Client) {
+        return $null;
+    }
+
     $SSLStream = New-Object System.Net.Security.SslStream($Client.GetStream(), $false)
     $SSLStream.AuthenticateAsServer($Certificate, $false, [System.Security.Authentication.SslProtocols]::Tls12, $true) | Out-Null;