# HG changeset patch
# User James D. Callahan III <jcallahan@curse.com>
# Date 1360168058 21600
# Node ID 25bfbe8b4826711132a875910975af033841d305
# Parent  6c78c5c7aee4749020d532aca832add2d4abcb9c
Account for invalid GUIDs when attempting to extract unit type and ID.

diff -r 6c78c5c7aee4 -r 25bfbe8b4826 Main.lua
--- a/Main.lua	Tue Jan 29 17:45:38 2013 -0600
+++ b/Main.lua	Wed Feb 06 10:27:38 2013 -0600
@@ -407,16 +407,21 @@
 
 local ParseGUID
 do
+    local UNIT_TYPES = private.UNIT_TYPES
     local UNIT_TYPE_BITMASK = 0x007
 
     function ParseGUID(guid)
         if not guid then
             return
         end
-        local types = private.UNIT_TYPES
-        local unit_type = _G.bit.band(tonumber(guid:sub(1, 5)), UNIT_TYPE_BITMASK)
+        local bitfield = tonumber(guid:sub(1, 5))
 
-        if unit_type ~= types.PLAYER and unit_type ~= types.PET then
+        if not bitfield then
+            return UNIT_TYPES.UNKNOWN
+        end
+        local unit_type = _G.bit.band(bitfield, UNIT_TYPE_BITMASK)
+
+        if unit_type ~= UNIT_TYPES.PLAYER and unit_type ~= UNIT_TYPES.PET then
             return unit_type, tonumber(guid:sub(6, 10), 16)
         end
         return unit_type