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h2/src/main/org/h2/jdbc/JdbcResultSet.java

@@ -3517,6 +3517,7 @@ public class JdbcResultSet extends TraceObject implements ResultSet {
     }
 
     private Value convertToUnknownValue(Object x) throws SQLException {
+        checkClosed();
         return DataType.convertToValue(conn.getSession(), x, Value.UNKNOWN);
     }