diff --git a/Rakefile b/Rakefile
index 52f4771..727c781 100644
--- a/Rakefile
+++ b/Rakefile
@@ -165,6 +165,10 @@ def bom2(schematic, attributes)
   list.gsub!(/(?!http):(?!\/\/)/, '\1":"\2') # protect the values between ':' (such as URLs)
   # parse bom2
   csv = CSV.parse(list, col_sep: ":", quote_char: '"')
+  if csv.empty? then
+    $stderr.puts "no parts found for BOM"
+    return []
+  end
   csv[1..-1].each do |row|
     line = {}
     row.each_index do |col|