I try execute query
from Meeting where notificationSended=true
but Exception occured

org.postgresql.util.PSQLException: ERROR: operator does not exist: boolean = integer
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102) ~[postgresql-9.1-901.jdbc4.jar:na]
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835) ~[postgresql-9.1-901.jdbc4.jar:na]
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257) ~[postgresql-9.1-901.jdbc4.jar:na]


hibernate produce
select ...fields.. from Meeting meeting0_ where meeting0_.notificationSended=1
No hibernate.query.substitutions in my config
hibernate version 4.1.9.Final

How to fix this error?