Cloud Agent Controller tries to create duplicated security group and causes error

I am using cloud agent controller to spin up EC server on AWS for performance testing.  The first attempt worked fine, however when I tried the second time, it was not working.  The first attempt created a security group to allow port 1991 and when the first test ended, that security group was not deleted.  When the second test try to create the same security group, AWS refused to create that duplicated security group.  I have to delete that security group manually from the AWS console to make the cloud agent controller working again.  It is very inconvenient.  Is there any way this can be avoided?