diff --git a/src/mfm_dup.cpp b/src/mfm_dup.cpp
index 480d7445..73ae8cdd 100644
--- a/src/mfm_dup.cpp
+++ b/src/mfm_dup.cpp
@@ -47,7 +47,7 @@ mfm::dup(const Opts::Dup &opts_)
         }
       else
         {
-          throw std::runtime_error("invalid file type");
+
         }
     }
 }