diff --git a/exe/mm2ep-depend b/exe/mm2ep-depend
index 8c3f533..283aa75 100755
--- a/exe/mm2ep-depend
+++ b/exe/mm2ep-depend
@@ -30,8 +30,8 @@ module Mm2ep
         puts "EVAL: #{token.to_s}"
 
         parser.check_grammar line, token
-        exit 1 unless token.errors.empty? || token.nil?
-        
+        exit 1 unless !token.nil? && token.errors.empty? 
+
         puts "RESULT: #{token.compute}"
 
       end