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java.lang.NullPointerException: null	at eu.qualimaster.algorithms.imp.correlation.PriorityDataSinkForFinancialAndTwitter.disconnect(PriorityDataSinkForFinancialAndTwitter.java:155)	at eu.qualimaster.PriorityPip.topology.PriorityPip_Sink0Sink.cleanup(PriorityPip_Sink0Sink.java:118)