diff --git a/luprex/ext/eris-master/src/lapi.c b/luprex/ext/eris-master/src/lapi.c
index feec81a5..f8390b78 100644
--- a/luprex/ext/eris-master/src/lapi.c
+++ b/luprex/ext/eris-master/src/lapi.c
@@ -203,6 +203,23 @@ LUA_API void lua_insert (lua_State *L, int idx) {
 }
 
 
+// Insert specified number of 'nil' at base of the stack.
+LUA_API void lua_insert_frame (lua_State *L, int count) {
+  StkId p, q;
+  if (count > 0) {
+    lua_lock(L);
+    api_check(L, L->top + count <= L->stack_last, "Not enough space to insert frame");
+    p = L->ci->func + 1;
+    for (q = L->top - 1; q >= p; q--)
+      setobjs2s(L, q + count, q);
+    L->top += count;
+    for (q = p + count; p < q; p++)
+      setnilvalue(p);
+    lua_unlock(L);
+  }
+}
+
+
 static void moveto (lua_State *L, TValue *fr, int idx) {
   TValue *to = index2addr(L, idx);
   api_checkvalidindex(L, to);
diff --git a/luprex/ext/eris-master/src/lua.h b/luprex/ext/eris-master/src/lua.h
index 385e9175..85a6e472 100644
--- a/luprex/ext/eris-master/src/lua.h
+++ b/luprex/ext/eris-master/src/lua.h
@@ -147,6 +147,7 @@ LUA_API void  (lua_settop) (lua_State *L, int idx);
 LUA_API void  (lua_pushvalue) (lua_State *L, int idx);
 LUA_API void  (lua_remove) (lua_State *L, int idx);
 LUA_API void  (lua_insert) (lua_State *L, int idx);
+LUA_API void  (lua_insert_frame) (lua_State *L, int count);
 LUA_API void  (lua_replace) (lua_State *L, int idx);
 LUA_API void  (lua_copy) (lua_State *L, int fromidx, int toidx);
 LUA_API int   (lua_checkstack) (lua_State *L, int sz);