Majordomo render a lua-error in latest update

When I click majordomo in menu from safari on my iPhone I get this error.

/usr/lib/lua/luci/dispatcher.lua:460: Failed to execute firstchild dispatcher target for entry ‘/admin/statistics/majordomo’.
The called action terminated with an exception:
/usr/lib/lua/luci/dispatcher.lua:460: Failed to execute call dispatcher target for entry ‘/admin/statistics/majordomo/overview’.
The called action terminated with an exception:
/usr/share/lcollect/lua/majordomo_lib.lua:280: I/O error
stack traceback:
[C]: in function ‘assert’
/usr/lib/lua/luci/dispatcher.lua:460: in function ‘dispatch’
/usr/lib/lua/luci/dispatcher.lua:141: in function </usr/lib/lua/luci/dispatcher.lua:140>

After a while it begin working again.

But I write all my logs to an external USB drive and even though the previous data is still there majordomo can not find.
So only data from today after the update are available.

It it possible to get the old data to live again?