NullPointerException while closing PreparedStatements

[Jay Mehta]

I get this error while I close a PreparedStatement. I have checked to see if the PreparedStatement was null before calling close on it, It is not null yet an error is thrown.My connection is also valid and this error is thrown sometimes.Can somebody help??
java.lang.NullPointerException
at oracle.jdbc.dbaccess.DBData.clearIt(DBData.jav(Compiled Code))
at oracle.jdbc.dbaccess.DBDataSetImpl.clearItem(DBDataSetImpl.java:2154)
at oracle.jdbc.driver.OraclePreparedStatement.clearParameters(OraclePreparedStatement.java:2594)
at com.ibm.ejs.cm.cache.CachedStatement.clearParameters(CachedStatement.java)
at com.ibm.ejs.cm.cache.StatementCache.releaseStatement(StatementCache.java)
at com.ibm.ejs.cm.cache.CachedStatement.close(CachedStatement.java)
at com.ibm.ejs.cm.proxy.StatementProxy.__close(StatementProxy.java(Compiled Code))
at com.ibm.ejs.cm.proxy.StatementProxy.close(StatementProxy.java(Compiled Code))