Portal 1: Crashing on 'Loading...' Screen

[Nagi_Def]

On chapter 19, after dropping down to the pipe where you need to shoot a portal ontop of the retracting pipe, you have to drop down a fenced square hole in order to progress. That's where the loading screen comes up and my games crash. I couldn't find any solid fix for this.

[Nagi_Def]

Please anyone help

[A Bottle of Merlot]

right click on game in your library, click local files tab, > Verify game cache