diff --git a/lib/tabulatr/rails/action_controller.rb b/lib/tabulatr/rails/action_controller.rb
index 10c3d89..fd1888d 100644
--- a/lib/tabulatr/rails/action_controller.rb
+++ b/lib/tabulatr/rails/action_controller.rb
@@ -27,13 +27,22 @@ class ActionController::Base
   end
 
   def tabulatr_for(relation, tabulatr_data_class: nil, serializer: nil, render_action: nil, default_order: nil, locals: {}, &block)
-    table_id = params[:table_id]
-    if table_id and relation.is_a?(Array)
-      controller_path = self.class.name.underscore.gsub('/', '-')
-      idx = relation.index do |r|
-        table_id.start_with? "#{Tabulatr::Utility.formatted_name(r.name)}_table_#{controller_path}_#{self.action_name}_"
+    if relation.is_a?(Array)
+      table_id = params[:table_id]
+      idx = nil
+      if table_id
+        controller_path = self.class.name.underscore.gsub('/', '-')
+        idx = relation.index do |r|
+          n = "#{Tabulatr::Utility.formatted_name(r.name)}_table_#{controller_path}_#{self.action_name}_"
+          table_id.start_with? n
+        end
+      end
+      if idx
+        relation = relation[idx]
+      else
+        render action: render_action || action_name
+        return
       end
-      relation = relation[idx]
     end
     klass = relation.respond_to?(:klass) ? relation.klass : relation
     locals[:current_user] ||= current_user if respond_to?(:current_user)