Game Crash - Surface Tension

On the first fight with the helicopter, I quicksaved in the garage reloaded a few seconds later. When I reloaded my game, it crashed and I got this error.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.