diff --git a/apis/builder/turtle.lua b/apis/builder/turtle.lua
index d85640c..fd5ff2f 100644
--- a/apis/builder/turtle.lua
+++ b/apis/builder/turtle.lua
@@ -119,12 +119,8 @@ function supplyPage:enable(builder)
 
   Event.addNamedTimer('supplyRefresh', 6, true, function()
     if self.enabled then
-debug('timer')
       self.builder:autocraft(self.builder:getSupplies())
-      pcall(function()
-        debug('refreshing')
-        self:refresh()
-      end)
+      self:refresh()
       self.statusBar:timedStatus('Refreshed ', 2)
       self:sync()
     end
@@ -133,7 +129,6 @@ debug('timer')
 end
 
 function supplyPage:disable()
-  debug('canceling')
   Event.cancelNamedTimer('supplyRefresh')
 end
 
@@ -158,6 +153,8 @@ function supplyPage:refresh()
   self.statusBar:timedStatus('Refreshed ', 3)
   local supplies = self.builder:getSupplies()
   if #supplies == 0 then
+    UI:setPage('blank')
+    self:sync()
     self.builder:build()
   else
     self:setSupplies(supplies)
diff --git a/apis/chestAdapter18.lua b/apis/chestAdapter18.lua
index 5c4425a..a0829d1 100644
--- a/apis/chestAdapter18.lua
+++ b/apis/chestAdapter18.lua
@@ -110,7 +110,8 @@ function ChestAdapter:getItemInfo(item)
     self:listItems()
   end
   local key = table.concat({ item.name, item.damage, item.nbtHash }, ':')
-  return self.cache[key]
+  local items = self.cache or { }
+  return items[key]
 end
 
 function ChestAdapter:getPercentUsed()
diff --git a/apps/builder.lua b/apps/builder.lua
index 04c5d32..d09fd21 100644
--- a/apps/builder.lua
+++ b/apps/builder.lua
@@ -723,6 +723,7 @@ function startPage:eventHandler(event)
 
   elseif event.type == 'begin' then
     UI:setPage('blank')
+    self:sync()
 
     print('Reloading schematic')
     Builder:reloadSchematic(Util.throttle())