https://wccftech.com/horizon-zero-dawn-patch-1-51-lootbox/

Developer Guerrilla Games has released Horizon Zero Dawn Patch 1.51 for PlayStation 4, which fixes a treasure box issue.

The patch addresses a crash that players have been experiencing when starting a New Game + with over 2000 treasure boxes in their inventory. In addition, the update also fixes a crash caused by certain particles effects. The official release notes have been included below: