Ruby on Rails

No no, the exactly error is "undefined method `sequence' for
nil:NilClass".

It looks I am getting the database object in var "high", but I can't to
get individual items from this object (like "sequence" or "name"). When
I am trying to print the sequence (puts high.sequence), I am getting
error "undefined method `sequence' for nil:NilClass".

If I look to data stored in database, I see:

{ "_id" : ObjectId("4d94f53fd3d8496acd00000d"), "name" : "John",
"surname" : "Smith", "level" : 0, "sequence" : 0 }

So I am a bit confused, where could be fail

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