Errors when Avira antivirus scans the system

Hi guys
I am using the Avira antivirus on my system. I started scanning files but when Avira is scanning my system, it suddenly gives me an error on the screen.
The screenshot of the error is attached below:

The message states:
Avscan.exe – Application error
The instruction at 0x72b1f7c9 referenced at 0x00000100. The memory could not be read.
Any help why this is happening will be highly appreciated.
Looking forward to your replies.
Kind regards.
