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Attempt to invoke interface method 'void org.postgresql.core.ProtocolConnection.close()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'void org.postgresql.core.ProtocolConnection.close()' on a null object reference	at org.postgresql.jdbc.PgConnection.close(PgConnection.java:690)	at org.postgresql.jdbc.PgConnection.finalize(PgConnection.java:924)	at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:191)	at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:174)	at java.lang.Thread.run(Thread.java:818)