diff --git a/cps/helper.py b/cps/helper.py
index d74318bf..26a3aa23 100644
--- a/cps/helper.py
+++ b/cps/helper.py
@@ -262,12 +262,15 @@ def delete_book_file(book, calibrepath, book_format=None):
                 return False
 
 
-def update_dir_structure_file(book_id, calibrepath):
+def update_dir_structure_file(book_id, calibrepath, first_author):
     localbook = db.session.query(db.Books).filter(db.Books.id == book_id).first()
     path = os.path.join(calibrepath, localbook.path)
 
     authordir = localbook.path.split('/')[0]
-    new_authordir = get_valid_filename(localbook.authors[0].name)
+    if first_author:
+        new_authordir = get_valid_filename(first_author)
+    else:
+        new_authordir = get_valid_filename(localbook.authors[0].name)
 
     titledir = localbook.path.split('/')[1]
     new_titledir = get_valid_filename(localbook.title) + " (" + str(book_id) + ")"
@@ -300,12 +303,15 @@ def update_dir_structure_file(book_id, calibrepath):
     return False
 
 
-def update_dir_structure_gdrive(book_id):
+def update_dir_structure_gdrive(book_id, first_author):
     error = False
     book = db.session.query(db.Books).filter(db.Books.id == book_id).first()
 
     authordir = book.path.split('/')[0]
-    new_authordir = get_valid_filename(book.authors[0].name)
+    if first_author:
+        new_authordir = get_valid_filename(first_author)
+    else:
+        new_authordir = get_valid_filename(book.authors[0].name)
     titledir = book.path.split('/')[1]
     new_titledir = get_valid_filename(book.title) + " (" + str(book_id) + ")"
 
@@ -356,11 +362,11 @@ def generate_random_password():
 
 ################################## External interface
 
-def update_dir_stucture(book_id, calibrepath):
+def update_dir_stucture(book_id, calibrepath, first_author = None):
     if ub.config.config_use_google_drive:
-        return update_dir_structure_gdrive(book_id)
+        return update_dir_structure_gdrive(book_id, first_author)
     else:
-        return update_dir_structure_file(book_id, calibrepath)
+        return update_dir_structure_file(book_id, calibrepath, first_author)
 
 
 def delete_book(book, calibrepath, book_format):
diff --git a/cps/web.py b/cps/web.py
index da240211..c779345b 100644
--- a/cps/web.py
+++ b/cps/web.py
@@ -532,6 +532,7 @@ def modify_database_object(input_elements, db_book_object, db_object, db_session
             type_elements = c_elements.name
         for inp_element in input_elements:
             if inp_element.lower() == type_elements.lower():
+                # if inp_element == type_elements:
                 found = True
                 break
         # if the element was not found in the new list, add it to remove list
@@ -3656,22 +3657,24 @@ def edit_book(book_id):
         # we have all author names now
         if input_authors == ['']:
             input_authors = [_(u'unknown')]  # prevent empty Author
-        if book.authors:
-            author0_before_edit = book.authors[0].name
-        else:
-            author0_before_edit = db.Authors(_(u'unknown'), '', 0)
+
         modify_database_object(input_authors, book.authors, db.Authors, db.session, 'author')
-        if book.authors:
-            if author0_before_edit != book.authors[0].name:
-                edited_books_id = book.id
-                book.author_sort = helper.get_sorted_author(input_authors[0])
+
+        sort_authors_list = list()
+        for inp in input_authors:
+            sort_authors_list.append(helper.get_sorted_author(inp))
+        sort_authors = ' & '.join(sort_authors_list)
+        if book.author_sort != sort_authors:
+            edited_books_id = book.id
+            book.author_sort = sort_authors
+
 
         if config.config_use_google_drive:
             gdriveutils.updateGdriveCalibreFromLocal()
 
         error = False
         if edited_books_id:
-            error = helper.update_dir_stucture(edited_books_id, config.config_calibre_dir)
+            error = helper.update_dir_stucture(edited_books_id, config.config_calibre_dir, input_authors[0])
 
         if not error:
             if to_save["cover_url"]: