No, as most of us here are not working for avast there isn't much we can do in situations like this.
It is up to avast to analyze the file and change the detection or remove it (whatever is needed).
On a note.
Defrag really helped in the old days when FAT was used.
With NTFS and the Linux partition it is not needed anymore as files are stored/drives are read in another way.
Next to the change of the file system, there is also the speed increase in the hardware.
So unless you are still using the FAT system there is no need to defrag a drive anymore.
Unless you have a e.g. 250Tb drive that is almost full, you will not notice a speed increase after a defrag.