Clonezilla fails at cloning with mismatched GPT and MBR partition

I got this message:

This disk contains mismatched GPT and MBR partition: /dev/sda

Clonezilla's FAQ says:

You might have installed an OS with GPT partition table, and later overwrite the disk by installing another OS with MBR partition table. The MBR partition table editor, e.g. fdisk, sfdisk, or cdisk does not know GPT, so it overwrite part of the GPT partition table, but did not clean the rest completely. Therefore that's why you got such a message.

If you are sure your running OS is using MBR partition table, not GPT one, you can run sudo sgdisk -z /dev/sdx (Replace /dev/sdx with your disk name, e.g. /dev/sda for the 1st hard drive) to clean the GPT partition table, while keep the MBR partition table. //NOTE// Use the above command carefully. It might destroy everything on the harddrive.

I installed Mac first and Windows second, then replaced the default MBR boot manager with Chameleon Boot Loader.

Here's the partition table:

   #:                       TYPE NAME                    SIZE       IDENTIFIER   0:      GUID_partition_scheme                        *1.0 TB     disk0   1:                        EFI EFI                     209.7 MB   disk0s1   2:                  Apple_HFS macintosh               69.3 GB    disk0s2   3:                  Apple_HFS mavericks               180.0 GB   disk0s3   4:       Microsoft Basic Data Melomano                749.9 GB   disk0s4

Disk0s3 is the current MacOSX partition, disk0s2 is a Time Machine backup and disk0s4 is Windows 8.1.

What should I do?