File deleted during transfer

Hi,
We are using SmartFTP to transfer files between two drives, one local and one remote.
 
We have used the online video to help us to schedule a basic file transfer between the two folders every 15 minutes.
 
All works brilliantly (yeyy!) but every so often we hit a problem. 
 
After SmartFTP has built its transfer queue and started comparing/transferring it a user may delete a file in the source folder.
 
When SmartFTP gets to this file it then gets stuck in an endless loop - "well, this file was here a minute ago, it must be here now",  "well, this file was here a minute ago, it must be here now", "well, this file was here a minute ago, it must be here now" ...
 
Any ideas on how we can stop SmartFTP from doing this and just carry on?
 
Thanks
Ed

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