diff --git a/ip/ipmaddr.c b/ip/ipmaddr.c
index 2418b30..462b409 100644
--- a/ip/ipmaddr.c
+++ b/ip/ipmaddr.c
@@ -150,6 +150,8 @@
 
 			sscanf(buf, "%d%s", &m.index, m.name);
 			len = strlen(m.name);
+			if (len == 0)
+				continue;
 			if (m.name[len - 1] == ':')
 				m.name[len - 1] = '\0';
 			continue;