From f8d7731b5661beb195ed04741a70316f4d0df0bd Mon Sep 17 00:00:00 2001
From: Enyby <enyby@yandex.ru>
Date: Mon, 14 Oct 2019 14:12:08 +0300
Subject: [PATCH] Fix NPE on getobjname in some cases.

---
 src/core/org/luaj/vm2/lib/DebugLib.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/org/luaj/vm2/lib/DebugLib.java b/src/core/org/luaj/vm2/lib/DebugLib.java
index 5bb9fb6a..a81ef230 100644
--- a/src/core/org/luaj/vm2/lib/DebugLib.java
+++ b/src/core/org/luaj/vm2/lib/DebugLib.java
@@ -802,7 +802,7 @@ public class DebugLib extends TwoArgFunction {
 			case Lua.OP_GETUPVAL: {
 				int u = Lua.GETARG_B(i); /* upvalue index */
 				name = u < p.upvalues.length ? p.upvalues[u].name : QMARK;
-				return new NameWhat( name.tojstring(), "upvalue" );
+				return name == null ? null : new NameWhat( name.tojstring(), "upvalue" );
 			}
 		    case Lua.OP_LOADK:
 		    case Lua.OP_LOADKX: {