com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/DesignBrowser.java

@@ -205,6 +205,10 @@ public class DesignBrowser {
 						txTableViewer.setInput(object);
 						updateButtons();
 					}
+					else { //if selection is changed but empty
+						txTableViewer.setInput(null);
+						updateButtons();
+					}
 				}
 			}
 		});