avoid potential NPE

diff --git a/eu.etaxonomy.taxeditor.editor/src/main/java/eu/etaxonomy/taxeditor/editor/view/descriptive/e4/FactualDataPartE4.java b/eu.etaxonomy.taxeditor.editor/src/main/java/eu/etaxonomy/taxeditor/editor/view/descriptive/e4/FactualDataPartE4.java
index 8f6c80b5bbb3cce86cdc85029c4e340b7f4c73ea..91599ef7f5bb3519b0a1f79c9d8d6a2923cecec1 100644 (file)
--- a/eu.etaxonomy.taxeditor.editor/src/main/java/eu/etaxonomy/taxeditor/editor/view/descriptive/e4/FactualDataPartE4.java
+++ b/eu.etaxonomy.taxeditor.editor/src/main/java/eu/etaxonomy/taxeditor/editor/view/descriptive/e4/FactualDataPartE4.java
@@ -169,8 +169,9 @@ public class FactualDataPartE4 extends AbstractCdmEditorPartE4
                 }
                 featureNodeContainerCache.clear();
                 showViewer(structuredSelection, activePart, viewer);
-
-                this.viewer.getControl().setEnabled(isEnabled());
+                if ( viewer.getControl() != null &&!this.viewer.getControl().isDisposed()){
+                    this.viewer.getControl().setEnabled(isEnabled());
+                }
                 return;
             }
         }
@@ -262,4 +263,6 @@ public class FactualDataPartE4 extends AbstractCdmEditorPartE4
         return null;
     }
 
+
+
 }
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