diff --git a/Core/src/org/sleuthkit/autopsy/corecomponents/DataResultPanel.java b/Core/src/org/sleuthkit/autopsy/corecomponents/DataResultPanel.java
index ff2ff6da87..aaf091c278 100644
--- a/Core/src/org/sleuthkit/autopsy/corecomponents/DataResultPanel.java
+++ b/Core/src/org/sleuthkit/autopsy/corecomponents/DataResultPanel.java
@@ -341,6 +341,7 @@ public class DataResultPanel extends javax.swing.JPanel implements DataResult, C
 
         if (null != explorerManager && null != emNodeSelectionListener) {
             explorerManager.removePropertyChangeListener(emNodeSelectionListener);
+            explorerManager = null;
         }
         
         // clear all set nodes