Should resolve issue 323. Apparently SetObjective is being called explicitly with nil on line 259. Resolution is to check to see if we're getting nil or not. If something comes in, we then assert.

QuestHelper/dodads.lua

@@ -1105,10 +1105,12 @@ function QuestHelper:CreateMipmapDodad()
   end
   
   function icon:SetObjective(obj)
-    QuestHelper: Assert(obj.loc, "Objective has no location data.")
-    QuestHelper: Assert(obj.loc.c, "c is nil")
-    QuestHelper: Assert(obj.loc.x, "x is nil")
-    QuestHelper: Assert(obj.loc.y, "y is nil")
+    if obj then
+      QuestHelper: Assert(obj.loc, "Objective has no location data.")
+      QuestHelper: Assert(obj.loc.c, "c is nil")
+      QuestHelper: Assert(obj.loc.x, "x is nil")
+      QuestHelper: Assert(obj.loc.y, "y is nil")
+    end
     self:SetHeight(20*QuestHelper_Pref.scale)
     self:SetWidth(20*QuestHelper_Pref.scale)