laravel crashes because of undefined index?

recently i've started using laravel. but i am wondering why it crashes and throw exception because of undefined index.

for example:

$arr=[]; return $arr1;

this causing the app to crash and return code 500. this is not good at all. i don't need it to crash, it should just return null.

How could i handle this ?

other suggest to wrap each line with isset for example:

if(isset($arr[1]))
   return $arr[1]

i can't go through all my code and wrap each line with isset. that's tough work.

EDIT: this is not a code issue, i am pretty sure this is from laravel ,here is why:

in my laravel project at routes.php file i have set this:

$app->get ( "testException", function (Illuminate\Http\Request $request) {
    $arr=[];
    return $arr[1];
} );

when i call localhost/testException it throw this error and return exception code 500:

but when i run the same code without using laravel in separate script it runs without any problem.

Thanks

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