Indexed by another process

I do a complex multi db search from a button in a form. Before proceeding, I do db.UpdateFTIndexfor every db searched.

Everything was fine so far, but this morning a user has the following error :

Database is currently indexed by another process, and then it gives me the db path. It’s only one db with this problem and only one user.

I remember I had the same problem few times on the server version, and I then thought that there was an indexing server task running in the same time with my update index line of code.

But this is a local replica, used especially so that the search time gets shorter. Is there any indexing local task running on my user workstation ?

Any ideas ?

TIA