Dead block occur when delete session in search list

Search in session manager and got result, then if I delete one session (maybe last one), the WindTerm will block, no more response.
Maybe I meet a dead lock, maybe a dead loop. I will try to read code later...

Reproduce the issue in the session manager by searching for sessions and deleting a result, especially the last one. Inspect the session deletion path and determine whether the application blocks or loops; done means deletion completes and the terminal remains responsive.

Written by the indexing model from the issue text.