Commented by: @cincuranet

Provide steps to reproduce.

Commented by: Radu Simen (radu103)

The idea is simple:
- multiple commands and connections that have not finished their work (for autocomplete on a field)
- that window that has launched those requests has closed.

For every keystroke one command is launched and if another is pressed while the request is working, the first one is stoped.
In the mean while if the parent form is closed the application crashes. In the application everyting is in a try/catch block but the application still crashes.

Anyway those block of code should be in a try/catch block so the application should not crash

Commented by: Radu Simen (radu103)

Maybe this will help.

When this crash occured there was nothing out of the ordinary in the application.
It just happened

Commented by: Radu Simen (radu103)

I think the problem is in RollbackImplicitTransaction function FbCommand.cs at line 788

int transactionCount = this.Connection.InnerConnection.Database.TransactionCount;

Maybe the 'this.Connection.InnerConnection.Database.TransactionCount;' has some null values when the parent window is closed and are more transactions not disposed yet.

I think a try catch there with logging to event log will be good.