Well, I was doing some editing for my youtube channel and I accidentally cut a part of the video so I hit CTRL + Z and the editor crashed.
This happens a lot lately, can someone tell me how to fix this or why this is happening?

Do you work on Linux or Windows? If you are on Linux use the AppImage. If you have still the crash, please describe the steps you are doing get the crash (how looks the timeline, type of clips, fps of the project).