diff --git a/official/import_filters.lua b/official/import_filters.lua
index 5980a72..04a8d5c 100644
--- a/official/import_filters.lua
+++ b/official/import_filters.lua
@@ -50,6 +50,7 @@ dt.register_import_filter("prefer raw over jpeg", function(event, images)
   local current_base = ""
   local jpg_indices = {}
   local other_format_found = false
+  table.insert(images, "")
   for i, img in ipairs(images) do
     local extension = img:match("[^.]*$"):upper()
     local base = img:match("^.*[.]")