Add check for nil group to system_context_requester

app/models/mixins/retirement_mixin.rb

@@ -257,6 +257,10 @@ def system_context_requester
       $log.info("System context defaulting to admin user because owner of #{name} (#{self.class}) not set or owner no longer found in database.")
       return User.super_admin
     end
+    if evm_owner.current_group.nil?
+      $log.info("System context defaulting to admin user because owner of #{name} (#{self.class}) was found but lacks a group.")
+      return User.super_admin
+    end
     $log.info("Setting retirement requester of #{name} to #{evm_owner_id}.")
     evm_owner
   end

spec/models/vm/retirement_management_spec.rb

@@ -34,6 +34,25 @@
       end
     end
 
+    context "with user lacking group" do
+      let(:user1) { FactoryBot.create(:user) }
+      let(:vm_with_owner_no_group) { FactoryBot.create(:vm, :evm_owner => user1, :host => FactoryBot.create(:host)) }
+
+      it "uses user as requester" do
+        vm_with_owner_no_group.update(:retires_on => 90.days.ago, :retirement_warn => 60, :retirement_last_warn => nil)
+
+        expect(vm_with_owner.retirement_last_warn).to be_nil
+        allow(MiqAeEngine).to receive_messages(:deliver => ['ok', 'success', MiqAeEngine::MiqAeWorkspaceRuntime.new])
+        vm_with_owner_no_group.retirement_check
+        status, message, result = MiqQueue.first.deliver
+        MiqQueue.first.delivered(status, message, result)
+
+        expect(vm_with_owner_no_group.retirement_last_warn).not_to be_nil
+        # the next test is only nil because we're not creating a true super admin in these specs
+        expect(vm_with_owner_no_group.retirement_requester).to eq(nil)
+      end
+    end
+
     context "without user" do
       before do
         user.destroy