fix stack underflow causing segfault on luajit

1 files changed, 2 insertions, 1 deletions

diff --git a/lmdb.c b/lmdb.c
index 41bb2cf..f81d555 100644
--- a/lmdb.c
+++ b/lmdb.c
@@ -391,8 +391,9 @@ static void mt(lua_State *L, const char *name, const struct luaL_Reg l[]) {
 	if (lua_isnil(L, -1)){
 		lua_pop(L, 1);
 		lua_setfield(L, -1, "__index");
+	} else {
+		lua_pop(L, 2);
 	}
-	lua_pop(L, 2);
 }
 
 static void parentmap(lua_State *L) {