Created Unassigned: Error saving settings? [7546]

You might want to look into this.
I'm using DNN710 and I'm getting this error when modifying editor settings (min height of editor):

2013-08-02 10:20:57,970 [servername][Thread:273][ERROR] DotNetNuke.Services.Exceptions.Exceptions - System.Data.SqlClient.SqlException (0x80131904): Violation of PRIMARY KEY constraint 'PK_HostSettings'. Cannot insert duplicate key in object 'dbo.HostSettings'. The duplicate key value is (DNNCKP#0#Templates).
The statement has been terminated.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at PetaPoco.Database.Execute(String sql, Object[] args)
at DotNetNuke.Data.PetaPoco.PetaPocoHelper.ExecuteNonQuery(String connectionString, CommandType type, String sql, Object[] args)
at DotNetNuke.Data.DataProvider.AddHostSetting(String SettingName, String SettingValue, Boolean SettingIsSecure, Int32 CreatedByUserID)
at DotNetNuke.Entities.Controllers.HostController.Update(ConfigurationSetting config, Boolean clearCache)
ClientConnectionId:ddcfbcdf-2677-4732-a8ce-afdd8ebbd41e