diff --git a/bugs b/bugs
index a3a0ec5f..5aa30736 100644
--- a/bugs
+++ b/bugs
@@ -143,3 +143,13 @@ Thu Mar  2 09:41:53 EST 2000
 >> lua_settable should check stack space (it could call a T.M.)
 (by lhf & celes; since 3.2; it was already fixed by fixed stack)
 
+** lparser.c
+Mon Apr  3 09:59:06 EST 2000
+>> '%' should be in expfollow
+(by Edgar Toernig; since 3.1; it was already fixed)
+
+** lbuiltin.c
+Mon Apr  3 10:05:05 EST 2000
+>> tostring() without arguments gives seg. fault.
+(by Edgar Toernig; since 3.0)
+
diff --git a/lbuiltin.c b/lbuiltin.c
index 8bd20248..a10ce99e 100644
--- a/lbuiltin.c
+++ b/lbuiltin.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbuiltin.c,v 1.99 2000/03/27 20:10:21 roberto Exp roberto $
+** $Id: lbuiltin.c,v 1.100 2000/03/29 20:19:20 roberto Exp roberto $
 ** Built-in functions
 ** See Copyright Notice in lua.h
 */
@@ -371,7 +371,7 @@ void luaB_next (lua_State *L) {
 
 
 void luaB_tostring (lua_State *L) {
-  lua_Object o = lua_getparam(L, 1);
+  lua_Object o = luaL_nonnullarg(L, 1);
   char buff[64];
   switch (ttype(o)) {
     case TAG_NUMBER: