That's an old crash report caused by vertical canvas.
If there's no crash report, then something else is causing the program to close.
streamelements plugin is known to cause this kind of issues.
Please remove it as described in the previous post.
Make sure the other plugins you have are updated and compatible with the version of OBS you're running.
This is caused by plugins:
21:56:32.987: Number of memory leaks: 57
Remove any other plugin you're not using.
Also, please review and follow directions and recommendations on the analyzer
OBS (Open Broadcaster Software) is free and open source software for video recording and live streaming. Stream to Twitch, YouTube and many other providers or record your own videos with high quality H264 / AAC encoding.
obsproject.com
Any other issue with a plugin is advised that you ask directly on the Discussion section of each plugin page.