Zypper Curl error while installing nvidia drivers from repo/godot

Kde is constantly freezes especially on godot game engine. Only mouse moves. When i try to install nvidia drivers i get curl error

Retrieving repository 'nvidia' metadata --------------------------------------------------------------------------------------------------------------------------------------------------\]
'https://download.nvidia.com/opensuse/leap/15.0/repodata/repomd.xml' için indirme(curl) hatası: Curl error 60
SSL certificate problem: self signed certificate in certificate chain

What should i do? Any help would be appreciated!

Thanks in advance