java.sql.SQLException: Duplicate entry '305-268435962' for key 1
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2921)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1570)
        at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedSt
atement.java:1085)
        at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPrepared
Statement.java:670)
        at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:770)
        at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.execute(NewProxyPr
eparedStatement.java:989)
        at net.sf.l2j.gameserver.ClientThread.storeRecipeBook(ClientThread.java:
282)
        at net.sf.l2j.gameserver.ClientThread.saveCharToDisk(ClientThread.java:1
39)
        at net.sf.l2j.gameserver.ClientThread.onDisconnect(ClientThread.java:116
)
        at net.sf.l2j.gameserver.Connection.close(Connection.java:179)
        at net.sf.l2j.gameserver.SelectorThread.closeClient(SelectorThread.java:
571)
        at net.sf.l2j.gameserver.SelectorThread.readData(SelectorThread.java:343
)
        at net.sf.l2j.gameserver.SelectorThread.run(SelectorThread.java:234)