diff --git a/net-http-server/src/main/java/org/xbib/net/http/server/session/OutgoingContextHandler.java b/net-http-server/src/main/java/org/xbib/net/http/server/session/OutgoingContextHandler.java
index 1d78b73..b9c8306 100644
--- a/net-http-server/src/main/java/org/xbib/net/http/server/session/OutgoingContextHandler.java
+++ b/net-http-server/src/main/java/org/xbib/net/http/server/session/OutgoingContextHandler.java
@@ -137,7 +137,7 @@ public class OutgoingContextHandler implements HttpHandler {
         PercentEncoder percentEncoder = PercentEncoders.getCookieEncoder(StandardCharsets.ISO_8859_1);
         DefaultCookie cookie = new DefaultCookie(sessionCookieName, percentEncoder.encode(cookieValue));
         String domain = extractDomain(host);
-        if ("localhost".equals(domain)) {
+        if (domain == null || "localhost".equals(domain)) {
             logger.log(Level.WARNING, "localhost not set as a cookie domain");
         } else {
             cookie.setDomain('.' + domain);
@@ -153,7 +153,7 @@ public class OutgoingContextHandler implements HttpHandler {
     private Cookie createEmptyCookie(String host, String path) {
         DefaultCookie cookie = new DefaultCookie(sessionCookieName);
         String domain = extractDomain(host);
-        if ("localhost".equals(domain)) {
+        if (domain == null || "localhost".equals(domain)) {
             logger.log(Level.WARNING, "localhost not set as a cookie domain");
         } else {
             cookie.setDomain('.' + domain);
@@ -168,6 +168,9 @@ public class OutgoingContextHandler implements HttpHandler {
     }
 
     private static String extractDomain(String fqdn) {
+        if (fqdn == null) {
+            return null;
+        }
         if ("localhost".equals(fqdn)) {
             return fqdn;
         }