diff --git a/coal-crafter.lua b/coal-crafter.lua
index 64f8040..ca9efc5 100644
--- a/coal-crafter.lua
+++ b/coal-crafter.lua
@@ -14,6 +14,20 @@ local STORAGE_INVENTORY_SIDE = 'front'
 local dropInStorageFn = turtle.drop
 local suckFromBufferFn = turtle.suckDown
 
+local function dropAll(side, dropFn)
+  for i=1, 16, 1 do
+    local count = turtle.getItemCount(i)
+
+    if count > 0 then
+      turtleUtils.waitForInventory(side, IDLE_TIME)
+
+      if not turtleUtils.dropSlot(i, dropFn) then
+        error('please empty the turtle inventory', 0)
+      end
+    end
+  end
+end
+
 local function countCoalItems(inventory)
   local total = 0
 
@@ -112,6 +126,9 @@ local function main()
   print('> Waiting for the front inventory (buffer chest)')
   local bufferInventory = turtleUtils.waitForInventory(STORAGE_BUFFER_SIDE, WAIT_INVENTORY_TIME)
 
+  print('> drop all')
+  dropAll(STORAGE_INVENTORY_SIDE, dropInStorageFn)
+
   print('> coal-crafter process started')
 
   while true do