Null/duplicate constraint for LastReadPost

2016-03-30 22:29:27 [WARN ][o-8080-exec-2313][RaD1KaL][           org.jtalks.jcommune] - Handler execution resulted in exception
org.springframework.dao.DataIntegrityViolationException: could not insert: [org.jtalks.jcommune.model.entity.LastReadPost]; SQL [insert into LAST_READ_POSTS (UUID, USER_ID, T
OPIC_ID, LAST_READ_POST_DATE) values (?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not insert: [org.jtalks
.jcommune.model.entity.LastReadPost]
        at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:643)
        at org.springframework.orm.hibernate3.HibernateExceptionTranslator.convertHibernateAccessException(HibernateExceptionTranslator.java:89)
        at org.springframework.orm.hibernate3.HibernateExceptionTranslator.translateExceptionIfPossible(HibernateExceptionTranslator.java:68)
        at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:58)
        at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
        at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:163)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
        at com.sun.proxy.$Proxy76.saveOrUpdate(Unknown Source)
        at org.jtalks.jcommune.service.transactional.TransactionalLastReadPostService.saveLastReadPost(TransactionalLastReadPostService.java:232)
        at org.jtalks.jcommune.service.transactional.TransactionalLastReadPostService.markTopicPageAsRead(TransactionalLastReadPostService.java:177)

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '48255-13628' for key 'UNIQUE_TOPIC_ID_USER_ID'
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.Util.getInstance(Util.java:386)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1041)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4187)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4119)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815)
        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458)
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375)
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359)
        at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:105)
        at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94)
        at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)
        ... 149 more