Oracle "Protocol violation" errors when accessing plugin settings

2017-08-28 23:58:47,870 WARN  [ajp-nio-9001-exec-75] *15THKEJx1438x303659x4 1rfct7u 171.70.124.198 "GET /mvc/error500 HTTP/1.1" o.h.e.jdbc.spi.SqlExceptionHelper SQL Error: 17401, SQLState: 99999
2017-08-28 23:58:47,870 ERROR [ajp-nio-9001-exec-75] *15THKEJx1438x303659x4 1rfct7u 171.70.124.198 "GET /mvc/error500 HTTP/1.1" o.h.e.jdbc.spi.SqlExceptionHelper Protocol violation: [ 114, ]
2017-08-28 23:58:47,871 ERROR [ajp-nio-9001-exec-75] *15THKEJx1438x303659x4 1rfct7u 171.70.124.198 "GET /mvc/error500 HTTP/1.1" o.s.t.support.TransactionTemplate Application exception overridden by rollback exception
org.hibernate.exception.GenericJDBCException: could not extract ResultSet
        at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
        at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
        at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
        at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:91)
        at org.hibernate.persister.entity.AbstractEntityPersister.loadEntityIdByNaturalId(AbstractEntityPersister.java:5046)
        at org.hibernate.event.internal.DefaultResolveNaturalIdEventListener.loadFromDatasource(DefaultResolveNaturalIdEventListener.java:124)
        at org.hibernate.event.internal.DefaultResolveNaturalIdEventListener.resolveNaturalId(DefaultResolveNaturalIdEventListener.java:91)
        at org.hibernate.event.internal.DefaultResolveNaturalIdEventListener.onResolveNaturalId(DefaultResolveNaturalIdEventListener.java:57)
        at org.hibernate.internal.SessionImpl.fireResolveNaturalId(SessionImpl.java:1115)
        at org.hibernate.internal.SessionImpl.access$2100(SessionImpl.java:176)
        at org.hibernate.internal.SessionImpl$BaseNaturalIdLoadAccessImpl.resolveNaturalId(SessionImpl.java:2645)
        at org.hibernate.internal.SessionImpl$NaturalIdLoadAccessImpl.load(SessionImpl.java:2758)
        at com.atlassian.stash.internal.plugin.HibernatePluginSettingDao.getByKey(HibernatePluginSettingDao.java:103)
        at com.atlassian.stash.internal.plugin.HibernatePluginSettingDao.get(HibernatePluginSettingDao.java:80)
        at com.atlassian.stash.internal.plugin.DefaultPluginSettings.lambda$getActual$0(DefaultPluginSettings.java:41)
        at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
        at com.atlassian.stash.internal.plugin.DefaultPluginSettings.getActual(DefaultPluginSettings.java:41)
        at com.atlassian.sal.core.pluginsettings.AbstractStringPluginSettings.get(AbstractStringPluginSettings.java:115)
        ... some frames trimmed
Caused by: java.sql.SQLException: Protocol violation: [ 114, ]
        at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:669)
        at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:249)
        at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:566)
        at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:215)
        at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:58)
        at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:776)
        at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:897)
        at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1034)
        at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3820)
        at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3867)
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1502)
        at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeQuery(ProxyPreparedStatement.java:52)
        at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeQuery(HikariProxyPreparedStatement.java)
        at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:82)
        ... 137 common frames omitted