---
 src/man.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- src/man.c
+++ src/man.c	2018-11-23 12:42:32.280720195 +0000
@@ -978,7 +978,7 @@ static const char *is_section (const cha
 {
 	const char **vs;
 
-	for (vs = section_list; *vs; vs++) {
+	for (vs = section_list; vs && *vs; vs++) {
 		if (STREQ (*vs, name))
 			return name;
 		/* allow e.g. 3perl but disallow 8139too and libfoo */
@@ -2776,7 +2776,7 @@ static int compare_candidates (const str
 		/* Find out whether lsource->ext is ahead of rsource->ext in
 		 * section_list.
 		 */
-		for (sp = section_list; *sp; ++sp) {
+		for (sp = section_list; sp && *sp; ++sp) {
 			if (!*(*sp + 1)) {
 				/* No extension */
 				if (!sec_left  && **sp == *(lsource->ext))
@@ -3738,7 +3738,7 @@ static int do_global_apropos (const char
 	} else
 		my_section_list = section_list;
 
-	for (sp = my_section_list; *sp; sp++)
+	for (sp = my_section_list; sp && *sp; sp++)
 		for (mp = manpathlist; *mp; mp++)
 			*found += do_global_apropos_section (*mp, *sp, name);
 
@@ -3927,7 +3927,7 @@ static int man (const char *name, int *f
 	else {
 		const char **sp;
 
-		for (sp = section_list; *sp; sp++) {
+		for (sp = section_list; sp && *sp; sp++) {
 			locate_page_in_manpath (*sp, name, &candidates, found);
 		}
 	}