A hotfix was released from NVIDIA to correct a few issues causing random crashes\errors while using an NVENC encoder and streaming Call of Duty: Modern Warfare.
For reference: https://twitter.com/NVIDIAStreaming/status/1218274561591955457?s=20
Download the hotfix via their official website:
This is a hotfix applied to 441.87, making it 442.01
Be sure you download the correct driver for yourself, STANDARD or DCH.
Once installed, it is recommended you reboot your PC.
There have been quite a few reports about OBS/SLOBS and COD: MW crashing\producing errors since the launch of the game, so hopefully, this resolves your issues!