diff --git a/src/calibre/customize/ui.py b/src/calibre/customize/ui.py
index 067185b0c3..c79b4ed98e 100644
--- a/src/calibre/customize/ui.py
+++ b/src/calibre/customize/ui.py
@@ -127,6 +127,7 @@ def get_file_type_metadata(stream, ftype):
                         mi = plugin.get_metadata(stream, ftype.lower().strip())
                         break
                     except:
+                        traceback.print_exc()
                         continue
     return mi