diff --git a/lib/integrations/slack/incoming_message_builder.rb b/lib/integrations/slack/incoming_message_builder.rb
index ec4f8e2b5..86c3c232b 100644
--- a/lib/integrations/slack/incoming_message_builder.rb
+++ b/lib/integrations/slack/incoming_message_builder.rb
@@ -37,7 +37,7 @@ class Integrations::Slack::IncomingMessageBuilder
     if message.present?
       SUPPORTED_MESSAGE_TYPES.include?(message[:type]) && !attached_file_message?
     else
-      params[:event][:files].any? && !attached_file_message?
+      params[:event][:files].present? && !attached_file_message?
     end
   end
 
diff --git a/spec/lib/integrations/slack/incoming_message_builder_spec.rb b/spec/lib/integrations/slack/incoming_message_builder_spec.rb
index 1695331c3..0eede30cf 100644
--- a/spec/lib/integrations/slack/incoming_message_builder_spec.rb
+++ b/spec/lib/integrations/slack/incoming_message_builder_spec.rb
@@ -61,6 +61,15 @@ describe Integrations::Slack::IncomingMessageBuilder do
         expect(conversation.messages.count).to eql(messages_count)
       end
 
+      it 'does not create message for invalid event type and event files is not present' do
+        messages_count = conversation.messages.count
+        message_with_attachments[:event][:files] = nil
+        builder = described_class.new(message_with_attachments)
+        allow(builder).to receive(:sender).and_return(nil)
+        builder.perform
+        expect(conversation.messages.count).to eql(messages_count)
+      end
+
       it 'saves attachment if params files present' do
         expect(hook).not_to eq nil
         messages_count = conversation.messages.count