Error saving to Grub

[Greg Dance]

I have changed the boot priority order of OS before this is reported.

btw, I also have Refind installed and to get to boot into Macos I have to use Grub.

ERROR-

failed running 'grub-mkconfig -o "/boot/grub/grub.cfg"' output:
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.15.0-70-generic
Found initrd image: /boot/initrd.img-4.15.0-70-generic
Found linux image: /boot/vmlinuz-4.15.0-69-generic
Found initrd image: /boot/initrd.img-4.15.0-69-generic
Found linux image: /boot/vmlinuz-4.15.0-70-generic
Found initrd image: /boot/initrd.img-4.15.0-70-generic
Found linux image: /boot/vmlinuz-4.15.0-69-generic
Found initrd image: /boot/initrd.img-4.15.0-69-generic
File descriptor 9 (/proc/2079/mounts) leaked on lvs invocation. Parent PID 7430: /bin/sh
error: out of memory.
error: syntax error.
error: Incorrect command.
error: syntax error.
Syntax error at line 325
Syntax errors are detected in generated GRUB config file.
Ensure that there are no errors in /etc/default/grub
and /etc/grub.d/* files or please file a bug report with
/boot/grub/grub.cfg.new file attached.
done

[Greg Dance (gregorydance)]

I decided to use the Revert button and then retry save, this produced the following errors.

ailed running 'grub-mkconfig -o "/boot/grub/grub.cfg"' output:
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.15.0-70-generic
Found initrd image: /boot/initrd.img-4.15.0-70-generic
Found linux image: /boot/vmlinuz-4.15.0-69-generic
Found initrd image: /boot/initrd.img-4.15.0-69-generic
File descriptor 9 (/proc/2079/mounts) leaked on lvs invocation. Parent PID 9566: /bin/sh
error: out of memory.
error: syntax error.
error: Incorrect command.
error: syntax error.
Syntax error at line 314
Syntax errors are detected in generated GRUB config file.
Ensure that there are no errors in /etc/default/grub
and /etc/grub.d/* files or please file a bug report with
/boot/grub/grub.cfg.new file attached.
done

[Daniel Richter (danielrichter2007)]

The error comes from this line:

menuentry "Macos" { exit {

... which is imported from /etc/40_custom.

Did you write this line yourself or is it somehow corrupted by grub customizer?