diff --git a/webservice/webservice.py b/webservice/webservice.py
index b77183891ddf8320d07a0b55579f289315d4c60b..881724e36f1dfb664227be9f0063999ce383e8d7 100644
--- a/webservice/webservice.py
+++ b/webservice/webservice.py
@@ -458,7 +458,7 @@ copy_blocklist_pattern = re.compile(
     r'\S*RAW-R\d{4}-(AGIPD|LPD|DSSC)\d{2}-S\d{5}.h5$')
 
 
-async def copy_untouched_files(file_list):
+async def copy_untouched_files(files_set):
     """ Copy those files which are not touched by the calibration
     to the output directory.
 
@@ -466,7 +466,13 @@ async def copy_untouched_files(file_list):
 
     Copying is done via an asyncio subprocess call
     """
-    for f in file_list:
+    if files_set:
+        Path(next(iter(files_set)).replace("raw", "proc")).parent.mkdir(
+            parents=True, exist_ok=True)
+    else:
+        return
+
+    for f in files_set:
         if copy_blocklist_pattern.match(f):
             continue
 
@@ -909,8 +915,8 @@ class ActionsServer:
                             thisconf["priority"] = str(priority)
 
                         detectors[karabo_id] = thisconf
-                copy_file_list = copy_file_list.difference(corr_file_list)
-                asyncio.ensure_future(copy_untouched_files(copy_file_list))
+                copy_file_set = copy_file_list.difference(corr_file_list)  # noqa
+                asyncio.ensure_future(copy_untouched_files(copy_file_set))
             except MigrationError as e:
                 logging.error("Migration issue", exc_info=e)
                 await update_mdc_status(self.mdc, 'correct', rid, str(e))