guild stash temporarily disappear

While using the gem stash in my guild stash, I accidently clicked the folder-plus-icon on the top-right of the guild stash view.

Then the gem stash disappeared, and the folder-plus-icon became grey. However, I did not see any new folder created, its totally disappeared. It didn't matter how many times I checked the stash or did anything else, it is just gone.

Luckily, I switched to another character and found the new folder with gem stash in it.