Mojave is a supported operating system since Illustrator version 23.×.
We request your help. Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
An error occurred while saving the commentAnonymous commented
Same here. Crashing on very simple illustration. Not enough memory to preview . . . then crashes. I have 32 MB Ram running Mojave.