Incorrect SQL / PHP time when debug.sql_explain is enabled

When debug.sql_explain parameter is enabled, incorrect SQL / PHP time is displayed (SQL time is always 0.000 while PHP time is always equal to the total time).

If debug.sql_explain param is disabled, the time is correct (because no DBAL involved into calculation).

It seems that there-s a problem with $this->sql_time in the function SQL_report() is not incremented for every SQL query (or set to 0 at the start for every function call).

debug.load_time is enabled for both cases.