I am also suffering the same issue, wonder if there is any resolution on this yet? ------------------------------------------------------------------------ If you reply to this email, your message will be added to the discussion below: http://drools.46999.n3.nabble.com/NullPointerException-with-LeftTupleInde... To unsubscribe from NullPointerException with LeftTupleIndexHashTable.remove(), click here <http://drools.46999.n3.nabble.com/template/NamlServlet.jtp?macro=unsubscr...;. NAML <http://drools.46999.n3.nabble.com/template/NamlServlet.jtp?macro=macro_vi...