prosody: Call tostring on the key being used for nil global read before concatenating it with a string.

1 files changed, 1 insertions, 1 deletions

diff --git a/prosody b/prosody
index 2ca4241c..593a0e34 100755
--- a/prosody
+++ b/prosody
@@ -286,7 +286,7 @@ end
 function init_global_protection()
 	-- Catch global accesses
 	local locked_globals_mt = {
-		__index = function (t, k) log("warn", "%s", debug.traceback("Attempt to read a non-existent global '"..k.."'", 2)); end;
+		__index = function (t, k) log("warn", "%s", debug.traceback("Attempt to read a non-existent global '"..tostring(k).."'", 2)); end;
 		__newindex = function (t, k, v) error("Attempt to set a global: "..tostring(k).." = "..tostring(v), 2); end;
 	};