Steps to reproduce the behaviour:
1.
Make Project with a TMSConnection on it. Set Database connection properties. Set Connected to TRUE and Options.KeepDesignConnected to FALSE
2. Save the project and close Delphi
3. Open for example Microsoft SQL Management Studio, type a query against the same database and run it. Let the query open.
4. Start Delphi, open the project and try to debug (not run, debug) it. Boing! Crash!
Maybe you find a solution for that?