Fixed bug when group_ids not present when creating

app/controllers/projects/project_members_controller.rb

@@ -55,6 +55,7 @@ class Projects::ProjectMembersController < Projects::ApplicationController
       current_user: current_user
     )
 
+    if params[:group_ids].present?
       group_ids = params[:group_ids].split(',')
       groups = Group.where(id: group_ids)
 
@@ -65,6 +66,7 @@ class Projects::ProjectMembersController < Projects::ApplicationController
           expires_at: params[:expires_at]
         )
       end
+    end
 
     redirect_to namespace_project_project_members_path(@project.namespace, @project)
   end