diff --git a/lib/simple_form/inputs/grouped_collection_select_input.rb b/lib/simple_form/inputs/grouped_collection_select_input.rb
index e71d89b8..bd40ee53 100644
--- a/lib/simple_form/inputs/grouped_collection_select_input.rb
+++ b/lib/simple_form/inputs/grouped_collection_select_input.rb
@@ -19,7 +19,7 @@ module SimpleForm
 
       # Sample collection
       def collection
-        @collection ||= grouped_collection.first.try(:send, group_method)
+        @collection ||= grouped_collection.first.try(:send, group_method) || []
       end
 
       def group_method
diff --git a/test/inputs/grouped_collection_select_input_test.rb b/test/inputs/grouped_collection_select_input_test.rb
index a45937ed..3ad676d3 100644
--- a/test/inputs/grouped_collection_select_input_test.rb
+++ b/test/inputs/grouped_collection_select_input_test.rb
@@ -20,6 +20,15 @@ class GroupedCollectionSelectInputTest < ActionView::TestCase
     end
   end
 
+  test 'grouped collection accepts empty array collection form' do
+    with_input_for @user, :tag_ids, :grouped_select,
+      :collection => [],
+      :group_method => :last
+
+    assert_select 'select.grouped_select#user_tag_ids'
+  end
+
+
   test 'grouped collection accepts proc as collection' do
     with_input_for @user, :tag_ids, :grouped_select,
       :collection => Proc.new { [['Authors', ['Jose', 'Carlos']], ['General', ['Bob', 'John']]] },