bingo's index table would disappear for no apparent reason

I installed and used bingo(Version:1.8.0beta1-gef02bfd win64) on SQL Server2005, it could work properly, but the index table disappeared at times. How can I avoid this? Or how do I find why the index table is automatically deleted?

The report concerns bingo 1.8.0beta1 on SQL Server 2005, but it names no source files, tests, or entry points. Start by reproducing the disappearing index table and inspect the database activity around its deletion; done means identifying the cause and documenting or implementing a reliable way to prevent it.

Written by the indexing model from the issue text.