Shutter Forgets FTP Credentials for Uploading Screenshots

Every two or three weeks, Shutter forgets the ftp credentials that I've set for uploading screenshots and making them available via a website URL.

It is a good thing I've backed up my home folder. I'm able to fix the issue each time by replacing this folder with my backup copy of that same folder:
/home/user/.shutter

So, the .shutter folder is getting corrupted every few weeks, requiring me to replace it with a my backup copy that is not corrupted.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: shutter 0.93.1-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Nov 17 09:43:44 2016
InstallationDate: Installed on 2016-10-20 (28 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: shutter
UpgradeStatus: No upgrade log present (probably fresh install)