undefined method `split' for nil:NilClass - Stripe issues - ruby-on-rails

Question

I'm currently trying to set up a payment option on my patform (part of the tutorial) through stripe. For some reason I'm getting the Nil Class error on the /add_card page when someone enters the card details in and clicks the button ADD. Not sure what am I doing wrong here.
Any ideas would be greatly appreciated!
Thanks
Users_Controller
def add_card
if current_user.stripe_id.blank?
customer = Stripe::Customer.create(
email: current_user.email
)
current_user.stripe_id = customer.id
current_user.save
#customer.sources.create(source: params[:stripeToken])
else
customer = Stripe::Customer.retrieve(current_user.stripe_id)
end
# Add Credit Card to Stripe
month, year = params[:expiry].split(/ \/ /)
new_token = Stripe::Token.create(:card =>{
:number => params[:number],
:exp_month => month,
:exp_year => year,
:cvc => params[:cvv]
})
customer.sources.create(source: new_token.id)
flash[:notice] = "Your card is saved."
redirect_to payment_method_path
rescue Stripe::CardError => e
flash[:alert] = e.message
redirect_to payment_method_path
end
Payment Form
<div class="col-md-9">
<div class="panel panel-default">
<div class="panel-heading">Payment Method</div>
<div class="panel-body">
<div class="container">
<div class='card' style="margin-bottom: 20px"></div>
<%= form_tag("/add_card", method: "post", id: "add-card") do %>
<div class="row pull-center">
<div class="col-md-12">
<div class="well">
<div class="row">
<div class="col-md-8 form-group">
<label>Card Number</label>
<input type="text" name="number" class="form-control">
</div>
<div class="col-md-4 form-group">
<label>Expiration</label>
<input type="text" placeholder="MM/YY" name="expriry" class="form-control">
</div>
</div>
<div class="row">
<div class="col-md-8 form-group">
<label>Name</label>
<input type="text" name="name" class="form-control">
</div>
<div class="col-md-4 form-group">
<label>CVV</label>
<input type="text" name="cvv" class="form-control">
</div>
</div>
<div class="row">
<div class="col-md-12 text right"></div>
<% if current_user.stripe_id.blank? %>
<button class="btn btn-normal btn-block">Addd Card</button>
<% else %>
<button class="btn btn-normal btn-block">Update Card</button>
<% end %>
</div>
</div>
</div>
</div>
<% end %>

Answer 1

The name of your expiry field in the form is expriry you have an extra r in there. Because of this the field you're looking at in your controller doesn't have a value so it evaluates to nil and you can't perform string methods on a nil object.
Change expriry to expiry in your form.