awk: Command line:2: { if ($3 == 0 || ($3 >= 1000 ^Unexpected newline or end of string

Error output

awk: Command line:2: { if ($3 == 0 || ($3 >= 1000
awk: Command line:2:                             ^ Unexpected newline or end of string

Samsung-printer_uninstall.sh

remove_GNOME_startup()
{	
	GID_MIN=`grep 'GID_MIN.*[0-9]' /etc/login.defs | grep -v 'SYSTEM_GID_MIN' | awk '{print $2}'` || GID_MIN=0
	GID_MAX=`grep 'GID_MAX.*[0-9]' /etc/login.defs | grep -v 'SYSTEM_GID_MAX' | awk '{print $2}'` || GID_MAX=100000
		
	for user in `cat /etc/passwd | awk -F : '{ if ($3 == 0 || ($3 >= '$GID_MIN' && $3 <= '$GID_MAX')) print $6 }' | sort | uniq`
	do
		remove_user_startup $user
	done	
}