Bug 413988 - NPE when IObservableValue disposed who got adapted using AdapterFactory

diff --git a/bundles/runtime/org.eclipse.fx.core.databinding/src/org/eclipse/fx/core/databinding/AdapterFactory.java b/bundles/runtime/org.eclipse.fx.core.databinding/src/org/eclipse/fx/core/databinding/AdapterFactory.java
index 0ec7d4b..829fbf4 100755
--- a/bundles/runtime/org.eclipse.fx.core.databinding/src/org/eclipse/fx/core/databinding/AdapterFactory.java
+++ b/bundles/runtime/org.eclipse.fx.core.databinding/src/org/eclipse/fx/core/databinding/AdapterFactory.java

@@ -389,10 +389,16 @@
 				

 				@Override

 				public void handleDispose(DisposeEvent event) {

-					fxInvalidationListeners.clear();

+					if( fxInvalidationListeners != null ) {

+						fxInvalidationListeners.clear();

+					}

+					

 					dbInvalidationListener = null;

 					

-					fxChangeListeners.clear();

+					if( fxChangeListeners != null ) {

+						fxChangeListeners.clear();	

+					}

+					

 					dbChangeListener = null;

 				}

 			});