--- smage/trunk/include/mozilla.sminc	2020/09/15 12:07:58	15615
+++ smage/trunk/include/mozilla.sminc	2020/09/16 10:27:46	15616
@@ -90,6 +90,8 @@
 	else
 		# write a pref value
 		[[ -z ${value} ]] && die "msetpref(): no \$value given"
+		# respect NULL values
+		[[ ${value} = NULL ]] && value=""
 
 		# handle escaped strings: