diff --git a/app/controllers/chat_channel_memberships_controller.rb b/app/controllers/chat_channel_memberships_controller.rb
index f8e0aa10d..6aac18e5f 100644
--- a/app/controllers/chat_channel_memberships_controller.rb
+++ b/app/controllers/chat_channel_memberships_controller.rb
@@ -2,7 +2,7 @@ class ChatChannelMembershipsController < ApplicationController
   after_action :verify_authorized
 
   def find_by_chat_channel_id
-    @membership = ChatChannelMembership.where(chat_channel_id: params[:chat_channel_id], user_id: current_user.id).first
+    @membership = ChatChannelMembership.where(chat_channel_id: params[:chat_channel_id], user_id: current_user.id).first!
     authorize @membership
     render json: @membership.to_json(
       only: %i[id status viewable_by chat_channel_id last_opened_at],
diff --git a/spec/requests/chat_channel_memberships_spec.rb b/spec/requests/chat_channel_memberships_spec.rb
index d4fe8fe49..093c71b3b 100644
--- a/spec/requests/chat_channel_memberships_spec.rb
+++ b/spec/requests/chat_channel_memberships_spec.rb
@@ -88,4 +88,12 @@ RSpec.describe "ChatChannelMemberships", type: :request do
       expect(ChatChannelMembership.find(membership.id).status).to eq("left_channel")
     end
   end
+
+  describe "GET /chat_channel_memberships/find_by_chat_channel_id" do
+    it "renders not_found" do
+      expect do
+        get "/chat_channel_memberships/find_by_chat_channel_id", params: {}
+      end.to raise_error(ActiveRecord::RecordNotFound)
+    end
+  end
 end