From f5fd15efb4aaa55bf68cd608333a741e5d5d8f51 Mon Sep 17 00:00:00 2001
From: Diego Pino Garcia <dpino@igalia.com>
Date: Wed, 6 Jun 2018 14:35:03 +0000
Subject: [PATCH] Fix attempt to index a nil value

---
 src/lib/ptree/ptree.lua | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lib/ptree/ptree.lua b/src/lib/ptree/ptree.lua
index 51ee8ac433..94d7765092 100644
--- a/src/lib/ptree/ptree.lua
+++ b/src/lib/ptree/ptree.lua
@@ -335,7 +335,8 @@ end
 -- accumulative sum.  Accumulative sum is initialized to aggregated counter
 -- value if any.
 local function compute_aggregated_value (k)
-   local ret = counters.archived[k][0] or 0
+   if not counters.archived[k] then return 0 end
+   local ret = counters.archived[k][0]
    for _,c in pairs(counters.active[k]) do
       ret = ret + counter.read(c)
    end