Merge pull request #113 from lorenzleutgeb/patch-1

Avoid NPE in WindowContextImpl
diff --git a/deltaspike/core/impl/src/main/java/org/apache/deltaspike/core/impl/scope/window/WindowContextImpl.java b/deltaspike/core/impl/src/main/java/org/apache/deltaspike/core/impl/scope/window/WindowContextImpl.java
index 0ad8440..a9ad9c8 100644
--- a/deltaspike/core/impl/src/main/java/org/apache/deltaspike/core/impl/scope/window/WindowContextImpl.java
+++ b/deltaspike/core/impl/src/main/java/org/apache/deltaspike/core/impl/scope/window/WindowContextImpl.java
@@ -82,6 +82,11 @@
     @Override
     public String getCurrentWindowId()
     {
+        if (windowHolder == null)
+        {
+            return null;
+        }
+
         return windowIdHolder.getWindowId();
     }