diff --git a/storage/itemstack.lua b/storage/itemstack.lua
index b3f356a..d9a92a4 100644
--- a/storage/itemstack.lua
+++ b/storage/itemstack.lua
@@ -8,12 +8,15 @@ local ItemStack = Sentinel:tag({}, Sentinel.ITEMSTACK)
 ItemStack.__index = ItemStack
 
 local function hookDebugger(context)
-  while true do
-    local errorCond = Debugger.debugREPL(function(retval)
-      Logger:error("->", retval)
+  local result, retval
+  repeat
+    result, retval = Debugger.debugREPL(function(r)
+      Logger:error("->", r)
     end, context)
-    Logger:error("x>", errorCond)
-  end
+    if not result then
+      Logger:error("x>", retval)
+    end
+  until result
 end
 
 function ItemStack:fromDetail(inv, detail, slot)