Error in application tab after firmware update

Issue:
I did update to the latest release 1.2.1

Setup:

LoRa® Server:

Details:
My application is now corrupted, I cannot do anything using the web app.
How can I recover this ?

The error message I get:
/usr/lib/lua/luci/dispatcher.lua:437: Failed to execute cbi dispatcher target for entry ‘/admin/lorawan/app’.
The called action terminated with an exception:
/usr/lib/lua/luci/template.lua:97: Failed to execute template ‘cbi/map’.
A runtime error occured: /usr/lib/lua/luci/template.lua:97: Failed to execute template ‘cbi/appsection’.
A runtime error occured: [string “/usr/lib/lua/luci/view/cbi/appsection.htm”]:40: attempt to compare nil with number
stack traceback:
[C]: in function ‘assert’
/usr/lib/lua/luci/dispatcher.lua:437: in function ‘dispatch’
/usr/lib/lua/luci/dispatcher.lua:168: in function

Thanks

I Just backup and reset the gateway, and it works now…