NoMethodError in Admin::Users#show
Showing /usr/src/app/app/views/active_admin/base/_logs.html.arb where line #3 raised:

undefined method `constantize' for nil:NilClass
Extracted source (around line #138):
136
137
138
139
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141

    assoc = obj.class.reflect_on_all_associations.detect { |e| e.name == assoc_name.to_sym }
    object = if assoc.polymorphic?
               obj.send(assoc.foreign_type.to_sym).constantize.find(obj.send(assoc.foreign_key.to_sym))
             else
               assoc.class_name.constantize.find_by(id: id)
             end

Trace of template inclusion: /usr/local/bundle/gems/activeadmin-1.3.0/app/views/active_admin/resource/show.html.arb

Rails.root: /usr/src/app

Application Trace | Framework Trace | Full Trace
app/helpers/audit_helper.rb:138:in `link_to_assoc'
app/helpers/audit_helper.rb:105:in `audited_prepare_value'
app/helpers/audit_helper.rb:84:in `block (2 levels) in instance_attr_changes'
app/helpers/audit_helper.rb:74:in `each'
app/helpers/audit_helper.rb:74:in `block in instance_attr_changes'
app/helpers/audit_helper.rb:71:in `instance_attr_changes'
app/helpers/audit_helper.rb:15:in `decorate_instance_changes'
app/views/active_admin/base/_logs.html.arb:3:in `block (2 levels) in _app_views_active_admin_base__logs_html_arb__4610284186347251722_47295033011220'
app/views/active_admin/base/_logs.html.arb:2:in `block in _app_views_active_admin_base__logs_html_arb__4610284186347251722_47295033011220'
app/views/active_admin/base/_logs.html.arb:1:in `new'
app/views/active_admin/base/_logs.html.arb:1:in `_app_views_active_admin_base__logs_html_arb__4610284186347251722_47295033011220'
app/admin/user.rb:43:in `block (2 levels) in <top (required)>'
Request
Parameters:

{"id"=>"50"}
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Response
Headers:

None