diff --git a/src/randomizer.lua b/src/randomizer.lua
index ca7bef5..12b6268 100644
--- a/src/randomizer.lua
+++ b/src/randomizer.lua
@@ -38,6 +38,10 @@ function C:setPath(path)
   csdirectory = path
 end
 
+function C:ready()
+  return csdirectory ~= nil
+end
+
 function C:randomize()
   resetLog()
   logNotice('=== Cave Story Randomizer v' .. VERSION .. ' ===')
diff --git a/src/ui/draw.lua b/src/ui/draw.lua
index 96483a9..9884fc2 100644
--- a/src/ui/draw.lua
+++ b/src/ui/draw.lua
@@ -20,8 +20,12 @@ layout.twitter.text = '(@shruuu and @duncathan_salt)'
 layout.footer.text = 'Original randomizer:\r\nshru.itch.io/cave-story-randomizer'
 
 layout.go:onPress(function()
-  C:setStatus(Randomizer:randomize())
-  Randomizer:new()
+  if Randomizer:ready() then
+    C:setStatus(Randomizer:randomize())
+    Randomizer:new()
+  else
+    C:setStatus("No Cave Story folder found!\r\nDrag and drop your Cave Story folder here.")
+  end
 end)
 
 function C:draw()