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This can happen when a disk configuration is changed. The initramfs RESUME partition and/or swap partition ID's get misaligned.

get the latest version of initramfs-tools
run sudo blkid to find the UUIDs of the current drives
make sure that the UUID of the swap drive defined in /etc/fstab matches the UUID returned above
make sure that the UUID of the RESUME drive in /etc/initramfs-tools/conf.d/resume matches the UUID returned above
run sudo update-initramfs -u
restart

The resume file looks like this:

RESUME=UUID=uuid-long-string-here