Horizon Zero Dawn update 1.51 is now available. Guerrilla Games announced that the latest patch will fix several crashing issues in-game. The developer has been very active patching the game, and now it has even less issues.
Check out the Horizon Zero Dawn update 1.51 patch notes:
CRASH FIXES

Fixed a crash caused by certain particles effects.
Fixed a crash for players who have over 2000 treasure boxes in their inventory when starting a New Game+.

This is certainly a smaller update, but Horizon Zero Dawn update 1.50 was much more substantial. Few the changes in that patch below:
GENERAL FIXES

? Fixed several visual issues.

? Fixed several geometry issues.

? Fixed several audio issues.

? Fixed an issue in ?The Forge of Winter? where some players would have the Time of Day locked after they skipped part of a cut scene.
? Fixed an issue in ?Into the Frozen Wilds? where the Time of Day would not transition to dawn while traversing through the tunnel when the player would enter between a certain time period.

? Fixed an issue in the tutorials for the Carja Rattler and the Shadow Rattler where machines from The Frozen Wilds would not count towards progression tutorials.

? Fixed an issue where the functionality of the new UI for Treasure Boxes was unclear to some players.

? Updated the inventory icons for the Master outfits.

? Fixed an issue where the Banuk Werak Chieftain Adept outfit would display the incorrect image of the outfit in the Inventory menu.

? Fixed an ...