$wgLogActionsHandlers normally contains class names, but on line 296, its treated as if it contained callbacks. This is normally not reached, unless $wgLogActions is not set.
I'm not sure if this is intentional as some sort of back compat thing. If it is, this should sanity check that the given value is_callable to prevent fatals. It would be nice if how that value is used was better documented.
Version: 1.22.0
Severity: normal