diff --git a/drivers/fujitsu/src/main/java/org/onosproject/drivers/fujitsu/FujitsuVoltControllerConfig.java b/drivers/fujitsu/src/main/java/org/onosproject/drivers/fujitsu/FujitsuVoltControllerConfig.java
index 2431d2d..173b58e 100644
--- a/drivers/fujitsu/src/main/java/org/onosproject/drivers/fujitsu/FujitsuVoltControllerConfig.java
+++ b/drivers/fujitsu/src/main/java/org/onosproject/drivers/fujitsu/FujitsuVoltControllerConfig.java
@@ -213,13 +213,13 @@
         try {
              editcfg = (XMLConfiguration) cfg;
         } catch (ClassCastException e) {
-            e.printStackTrace();
+            return null;
         }
         StringWriter stringWriter = new StringWriter();
         try {
             editcfg.save(stringWriter);
         } catch (ConfigurationException e) {
-            e.printStackTrace();
+            return null;
         }
         String s = stringWriter.toString();
         String fromStr = buildStartTag(TARGET, false) + target +