What steps will reproduce the problem?
1. Type a chat meesage and
2.  shift-right-click loot item link from InstanceTime addon
3. send message

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What is the expected output? What do you see instead?
you are then disconnected from WoW

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What version of the product are you using?
3.71 but it has been occurring for many prior version

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Do you have an error log of what happened?
no error log generated

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Please provide any additional information below
The issue seems to be is that the SetItemRef call is given bad data from FreierGeist_IT_Loot["item"]
It seems the bad data is not handled by the SetItemRef in Blizzard_CombatLog.lua
and it falls through into the oldSetItemRef call in Itemref.lua

FreierGeist_IT_Loot["item"] link data entries in later versions begin with a space which causes the problem

A WoW bug has also been posted at http://forums.worldofwarcraft.com/thread.html?topicId=18031239644

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Possible fixes
1) Fix FreierGeist_IT_Loot["item"] link data entries to not include the leading space
2) [recommend] Change the code in FreierGeist_IT_ScrollBarSetItemLink
  From
-    link = FreierGeist_IT_Loot["item"][lootindex][lineplusoffset];    
-    link = string.gsub(link, "|cff9d9d9d|H", "");
-    link = string.gsub(link, "|cffffffff|H", "");
-    link = string.gsub(link, "|cff1eff00|H", "");
-    link = string.gsub(link, "|cff0070dd|H", "");
-    link = string.gsub(link, "|cffa335ee|H", "");
-    link = string.gsub(link, "|cffff8000|H", "");
-    link = string.gsub(link, "|h[%(%w*%)]|h|r", "");
-    SetItemRef(link, FreierGeist_IT_Loot["item"][lootindex][lineplusoffset], "InstanceTimeLootEntry"..NumberForItemLink);
  To
+    _, itemLink = GetItemInfo(FreierGeist_IT_Loot["item"][lootindex][lineplusoffset]);
+    if (itemLink) then
+        _, _, itemString = string.find(itemLink, "^|c%x+|H(.+)|h%[.*%]");
+        if (itemString) then
+            SetItemRef(itemString, itemLink, "InstanceTimeLootEntry"..NumberForItemLink);
+        end
+    end