diff --git a/TOOLS/lua/autoload.lua b/TOOLS/lua/autoload.lua
index 39a39a9686..172924e409 100644
--- a/TOOLS/lua/autoload.lua
+++ b/TOOLS/lua/autoload.lua
@@ -320,16 +320,20 @@ local function find_and_add_entries()
 
     local extensions
     if o.same_type then
-        if EXTENSIONS_VIDEO[string.lower(this_ext)] ~= nil then
+        if EXTENSIONS_VIDEO[this_ext:lower()] then
             extensions = EXTENSIONS_VIDEO
-        elseif EXTENSIONS_AUDIO[string.lower(this_ext)] ~= nil then
+        elseif EXTENSIONS_AUDIO[this_ext:lower()] then
             extensions = EXTENSIONS_AUDIO
-        else
+        elseif EXTENSIONS_IMAGES[this_ext:lower()] then
             extensions = EXTENSIONS_IMAGES
         end
     else
         extensions = EXTENSIONS
     end
+    if not extensions then
+        msg.debug("stopping: no matched extentions list")
+        return
+    end
 
     local pl = mp.get_property_native("playlist", {})
     local pl_current = mp.get_property_number("playlist-pos-1", 1)