diff -u -r ntfs-3g_ntfsprogs-2015.3.14.orig/src/usermap.c ntfs-3g_ntfsprogs-2015.3.14/src/usermap.c
--- ntfs-3g_ntfsprogs-2015.3.14.orig/src/usermap.c  2015-03-14 15:10:12.000000000 +0100
+++ ntfs-3g_ntfsprogs-2015.3.14/src/usermap.c   2016-11-10 17:30:39.250985332 +0100
@@ -586,7 +586,7 @@
    cnt = get2l(attr, off + 4);
    x = 8;
    for (i = 0; i < cnt; i++) {
-       domapping(accname, (char *)NULL, (char*)NULL, 
+       domapping(accname, (char *)NULL, (char*)NULL,
                                        &attr[off + x + 8], 2);
        x += get2l(attr, off + x + 2);
    }
@@ -1006,8 +1006,16 @@
        printf("# For Windows account \"%s\" in domain \"%s\"\n",
            currentwinname, currentdomain);
        printf("# Replace \üser\" and \"group\" hereafter by matching Linux login\n");
-       printf("user::%s\n",decodesid(sid));
-       printf(":group:%s\n",decodesid(groupsid));
+       s = decodesid(sid);
+       if (s) {
+           printf("user::%s\n", s);
+           free(s);
+       }
+       s = decodesid(groudsid);
+       if (s) {
+           printf(":group:%s\n", s);
+           free(s);
+       }
        ok = AGREED;
    }
    return (ok);