We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
#5070 - Potential for t_mime_type to be NULL when editing a gallery item
Ultimately Apache does not have a default mime-type for a webp, which is why Composr did not get one to check.