Create Invisible Wall When Verticle P1 Exit Door is Closing

[CubieJudy]

As seen in this image. I am trapped and unable to finish the test chamber. Due to me having forgotten to check something and backing out. Not realizing I hit the trigger until I came back to the exit. An Invisible Wall should be added here to keep this from happening in a published map. (As in the preview map. it doesn't matter)