diff --git a/apps/dashboard/app/models/files.rb b/apps/dashboard/app/models/files.rb
index f513bc50c0..cae49265df 100644
--- a/apps/dashboard/app/models/files.rb
+++ b/apps/dashboard/app/models/files.rb
@@ -21,6 +21,14 @@ def self.files_to_zip(path)
   def ls(dirpath)
     Pathname.new(dirpath).each_child.map do |path|
       Files.stat(path)
+    end.select do |stats|
+      valid_encoding = stats[:name].to_s.valid_encoding?
+
+      unless valid_encoding
+        Rails.logger.warn("Not showing file '#{stats[:name]}' because it is not a UTF-8 filename.")
+      end
+
+      valid_encoding
     end.sort_by { |p| p[:directory] ? 0 : 1 }
   end