Index: db_command.c
===================================================================
RCS file: /cvsroot/src/sys/ddb/db_command.c,v
retrieving revision 1.160
diff -p -u -r1.160 db_command.c
--- db_command.c	17 Sep 2018 01:49:54 -0000	1.160
+++ db_command.c	22 Sep 2019 12:46:13 -0000
@@ -1241,6 +1241,8 @@ db_kernhist_print_cmd(db_expr_t addr, bo
     db_expr_t count, const char *modif)
 {
 
+	if (!have_addr)
+		addr = 0;
 	kernhist_print((void *)(uintptr_t)addr, count, modif, db_printf);
 }
 #endif