The error messages "Error while sending STATISTICS packet" are produced by the joomla framework and have nothing to do with Radicore.
You need to find out what is happening when std.table.class.inc passes control to dml.mysqli.class.inc. This happens in the _dml_deleteRecord() method which contains the following line of code:
$DML->deleteRecord($this->dbname_server, $this->tablename, $fieldarray);
It is the contents of $this->tablename which is put into the FROM clause of the delete statement, and this should NEVER be blank.