--- a/tools/perf/builtin-top.c	2016-04-19 23:44:02.000000000 -0700
+++ b/tools/perf/builtin-top.c	2016-06-20 15:08:44.397210036 -0700
@@ -766,7 +766,7 @@
 		 */
 		if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
 		    al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
-		    RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
+		    (al.map != NULL && RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]))) {
 			if (symbol_conf.vmlinux_name) {
 				char serr[256];
 				dso__strerror_load(al.map->dso, serr, sizeof(serr));