From ca5843aceac8189ac99d5122a02f0cb12411b2f0 Mon Sep 17 00:00:00 2001
From: Damien Elmes <gpg@ankiweb.net>
Date: Fri, 24 Apr 2020 11:23:31 +1000
Subject: [PATCH] only compare to previous note type if it exists

---
 rslib/src/notetype/mod.rs | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/rslib/src/notetype/mod.rs b/rslib/src/notetype/mod.rs
index dabef8b14..a9d73c0ab 100644
--- a/rslib/src/notetype/mod.rs
+++ b/rslib/src/notetype/mod.rs
@@ -239,10 +239,7 @@ impl Collection {
             nt.usn = self.usn()?;
         }
         self.transact(None, |col| {
-            if !preserve_usn {
-                let existing_notetype = col
-                    .get_notetype(nt.id)?
-                    .ok_or_else(|| AnkiError::invalid_input("no such notetype"))?;
+            if let Some(existing_notetype) = col.get_notetype(nt.id)? {
                 col.update_notes_for_changed_fields(nt, existing_notetype.fields.len())?;
                 col.update_cards_for_changed_templates(nt, existing_notetype.templates.len())?;
             }