Segfault with `lkt adm update`

Description

When doing a lkt adm update then any command, a segfault occurs. Moreover, lektor fails at deleting old karas that have been removed from kurisu.

Log lines

 ! [DB] database_update_del: Failed to step: unable to open database file
 ! [DB] database_update_del: Failed to step: unable to open database file
 . [REPO] __repo_get_all_id_async: Finished to deal with deleted kara
 ! [DB] database_updated: Failed to exec statement: unable to open database file
 . [THREAD] mthread_start_thread: Thread 0xd64afb7b470 ended (0)
 . [THREAD] mthread_start_thread: Thread 0xd64afb7b470 (vp: 0) was detached, join it
 . [THREAD END] mthread_join: Join thread 0xd64afb7b470
 . [THREAD END] mthread_join: Thread 0xd64afb7b470 joined
accept: Too many open files

Hints / Remarks

It may be due to unclosed files with the the lkt adm update command.