Rails - Jul 2011 - Error creating a validation in model when i have a before_filter on my controller

I dont know why, but my application run without errors when i dont put
the line:
    "validates :age, :numericality => true" on my model

if i put that line in the model, this one error appear:

"
You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.map

Extracted source (around line #19):

16:     <%= f.text_field :value %>
17:   </div>
18:   <div class="field">
19:     <%= f.select(:owner_id,
options_from_collection_for_select(@owners, :id, :name)) %>
20:   </div>
21:   <div class="field">
22: 	<%= f.select(:reservation_type_id,
options_from_collection_for_select(@reservation_types, :id, :name))%>

"

I think that the before_filter is been skipped, but i don''t know why
or how i could resolve it....

I hope that someone can help me to understand this, and thx.

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