Why does SQL Server Management Studio crash?
To fix the error, you should understand the actual error which is not displayed in the screenshot that you've provided in your question. You can view the actual error by reading the application events within the event viewer when the error occurs. 


Start by writing down the timestamp when the error happens.  
Open Event Viewer 
View the application logs and match the error message with the timestamp when the error occurred.


It's pretty common knowledge that Microsoft displays friendly errors to users when errors occur by default which generally leads the end user to questions that cant be answered, friendly error messages only complicate questions. You need to view the source. Feel free to ask your question again so that a professional can provide you a better professional response from a professionally written question with all the required dependencies.