Sorry to hear that you had that crash. I've run many seasons with CB2018 without that happening so am not sure why you encountered the problem.
My suggestion is to load the backup of your last successful save for that association. You can get to that by clicking on Restore Association Backup on the initial page that loads when you log into DDSCB2018. You can also get to it by going to the Backup folder within the Saves folder in the DDSCB2018 folder on your computer's C drive and clicking on the .cbb file for the association you want.
In the future, I recommend you set up within Options to have the game automatically save your association at the end of each month and also manually save more frequently as you complete important actions within your association. Saves don't take too long and protect you in the event that something goes awry.
Also, be sure to not to be doing other things on your computer when the game is doing weekly actions or saves (not saying you were doing that when the crash occurred, but just providing a suggestion for you in the future).
And if you have an Unhandled Exception occur, copy what the message says and send that along with what you were doing at the time plus the game files to
support@wolverinestudios.com so Gary can determine what went wrong and fix it for you, If he can, or fix the game if there is an actual issue occurring within the game program.
Hope you can get back to where you were by going to the last successful save. If not, create a new association and try again. As I said, what happened to you hasn't been happening to me or others who tested the game, so your next effort will likely be successful.