Undefined offset: 0

Hi I'm having a problem with my function in Model. But the error is referring to the Controller which focused on the function in the Model.
I already make it work but then the problem is I've added argument and it triggered the undefined offset, then I revert it to original syntax,
still the error occurs. Please help. Thank you.

Error: https://pasteboard.co/Hr97Elz.png

Controller: https://pasteboard.co/Hr97Elz.png

Model: https://pasteboard.co/Hr9kYmR.png

Error: https://pasteboard.co/Hr97Elz.png
Controller: https://pasteboard.co/Hr97Elz.png

You've accidentally pointed controller to error image, looks like pretty important part of trying to figure out what's going on

It would be easier to help if you would show some code.