We are facing exception while migrating our application from Jboss 7.1 to EAP 6.4. Also we our upgrading our application technologies :
JDK 1.6 to JDK 1.8
Seam 2.1 to 2.3.1.Final (Referring Application Lib)
Hibernate 3.2 to 4.2.18.Final (Referring EAP server)
JSF 1.2 to 2.1.28.Final (Referring EAP server)
Icefaces 1.8.2 to 3.3.0 (Open Version)(Referring to Application Lib)

Error :
12:45:58,306 INFO [stdout] (http-/127.0.0.1:8080-2) ERROR 09-01 12:45:58,306 (PreJsf2ExceptionHandlerFactory.java:log:309) -java.lang.NullPointerException intercepté durant le traitement de la méthode beforePhase() de RESTORE_VIEW 1 : UIComponent-ClientId=, Message=null

12:45:58,308 INFO [stdout] (http-/127.0.0.1:8080-2) ERROR 09-01 12:45:58,307 (PreJsf2ExceptionHandlerFactory.java:log:317) -

12:45:58,308 INFO [stdout] (http-/127.0.0.1:8080-2) java.lang.NullPointerException

12:45:58,308 INFO [stdout] (http-/127.0.0.1:8080-2) at org.icepush.util.ExtensionRegistry.getBestExtension(ExtensionRegistry.java:69)

12:45:58,308 INFO [stdout] (http-/127.0.0.1:8080-2) at org.icefaces.impl.push.servlet.ICEpushResourceHandler$ICEpushResourceHandlerImpl.beforePhase(ICEpushResourceHandler.java:171)

12:45:58,309 INFO [stdout] (http-/127.0.0.1:8080-2) at org.icefaces.impl.push.servlet.ICEpushResourceHandler.beforePhase(ICEpushResourceHandler.java:111)

12:45:58,309 INFO [stdout] (http-/127.0.0.1:8080-2) at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:228)

We are assuming that the above exception is due to open version of icefaces 3.3.0 and may be resolved by Licensed version of icefaces (ICEfaces EE 3.3.0_P04)
But we need a confirmation on this so that our application owner proceed to purchase the licensed version.
Please I would request any technical expert to review the above exception and confirm if that issue can be resolved by Icefaces version- ICEfaces EE 3.3.0_P04.

Note: The above issue is appearing when we are launching our application after deployment.
Please let me know if you need any further information.