If the boot partition is not found just log a message and carry on.

src/init

@@ -56,11 +56,15 @@ fi
 mount -t ext4 -o ro $IMG_DEVICE /mnt/img
 
 # Mount boot device and load squashfs module if present
+if findfs $BOOT_DEVIC &> /dev/null; then
 	mount -t vfat -o ro $BOOT_DEVICE /boot
 	if [[ -e /boot/modules/$(uname -r)/squashfs.ko ]]; then
 		insmod /boot/modules/$(uname -r)/squashfs.ko
 	fi
 	umount /boot
+else
+	echo "The 'boot' partition was not detected, not checking for squashfs kernel module."
+fi
 
 # Mount OS image
 mount -t squashfs -o ro /mnt/img/root-squash.img /mnt/lower