In a rails view the following:
<%= overlap_timeslots %> <%= overlap_timeslots.class %>
will display what is expected:
[145, 146, 147, 148, 149] Array

However the moment the following is inserted right after the above two objects,

    <% overlap_timeslots.each do |ot| %>
...
    <% end %>

rails complains with undefined method 'each' for nil for the overlap_timeslots.each statement. This is quite unexpected as the object is not nil two lines above.

What is causing this?