diff --git a/inventoryClient.lua b/inventoryClient.lua
index 56803ce..c8a3441 100644
--- a/inventoryClient.lua
+++ b/inventoryClient.lua
@@ -1268,15 +1268,15 @@ local function main()
                     -- Update all state from master
                     if message.cache then
                         cache.itemList      = message.cache.itemList      or cache.itemList
-                        cache.grandTotal    = message.cache.grandTotal    or cache.grandTotal
-                        cache.chestCount    = message.cache.chestCount    or cache.chestCount
-                        cache.totalSlots    = message.cache.totalSlots    or cache.totalSlots
-                        cache.usedSlots     = message.cache.usedSlots     or cache.usedSlots
-                        cache.freeSlots     = message.cache.freeSlots     or cache.freeSlots
-                        cache.usedRatio     = message.cache.usedRatio     or cache.usedRatio
+                        cache.grandTotal    = message.cache.grandTotal    ~= nil and message.cache.grandTotal or cache.grandTotal
+                        cache.chestCount    = message.cache.chestCount    ~= nil and message.cache.chestCount or cache.chestCount
+                        cache.totalSlots    = message.cache.totalSlots    ~= nil and message.cache.totalSlots or cache.totalSlots
+                        cache.usedSlots     = message.cache.usedSlots     ~= nil and message.cache.usedSlots  or cache.usedSlots
+                        cache.freeSlots     = message.cache.freeSlots     ~= nil and message.cache.freeSlots  or cache.freeSlots
+                        cache.usedRatio     = message.cache.usedRatio     ~= nil and message.cache.usedRatio  or cache.usedRatio
                         cache.dropperOk     = message.cache.dropperOk
                         cache.barrelOk      = message.cache.barrelOk
-                        cache.furnaceCount  = message.cache.furnaceCount  or cache.furnaceCount
+                        cache.furnaceCount  = message.cache.furnaceCount  ~= nil and message.cache.furnaceCount or cache.furnaceCount
                         cache.furnaceStatus = message.cache.furnaceStatus or cache.furnaceStatus
                     end
                     if message.activity then