Exception: Undefined offset: 0 while making a get request in laravel 5.4

getting Exception: Undefined offset: 0 while making a get request in laravel 5.4.

Not sure how to catch full error, i am pasting my code below:

ROUTE: Route::get('/merchants/create', function() { echo 'hellow'; });

instead of echoing hello

Exception: Undefined offset: 0

via Chebli Mohamed