EBS : For specific users after login Null pointer exceptions

Error:

## Detail 0 ##
java.lang.NullPointerException
at java.util.Hashtable.put(Unknown Source)
at oracle.apps.fnd.common.DBPreferenceStore.load(DBPreferenceStore.java:162)
at oracle.apps.fnd.wf.worklist.webui.NtfWorklistCO.processRequest(NtfWorklistCO.java:185)
at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:604)


Solution:

CREATE TABLE FND_USER_PREFERENCES_BKP AS SELECT * FROM FND_USER_PREFERENCES;
UPDATE FND_USER_PREFERENCES SET PREFERENCE_VALUE='NtfSubject,' WHERE USER_NAME='&User_name' AND PREFERENCE_NAME='ADVANCED_WL_SORT_PREF';
COMMIT;

Reference: You have encountered an unexpected Error for Some Users Login. Stacktrace shows java.lang.NullPointerException related to NtfWorklistCO.class (Doc ID 1684285.1)