From 12b98a8a0d6b68caf387fb225c58c5d4b802509b Mon Sep 17 00:00:00 2001
From: singerdmx <singerdmx@gmail.com>
Date: Mon, 28 Dec 2020 15:52:33 -0800
Subject: [PATCH] Update editor to catch targetChild null

---
 lib/models/documents/history.dart | 2 +-
 lib/widgets/editor.dart           | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/models/documents/history.dart b/lib/models/documents/history.dart
index d8f48239..423245ff 100644
--- a/lib/models/documents/history.dart
+++ b/lib/models/documents/history.dart
@@ -89,7 +89,7 @@ class History {
       return false;
     }
     Delta delta = source.removeLast();
-    Delta base = doc.toDelta();
+    Delta base = Delta.from(doc.toDelta());
     Delta inverseDelta = delta.invert(base);
     dest.add(inverseDelta);
     this.lastRecorded = 0;
diff --git a/lib/widgets/editor.dart b/lib/widgets/editor.dart
index d17e76ad..4fbd5a6b 100644
--- a/lib/widgets/editor.dart
+++ b/lib/widgets/editor.dart
@@ -890,7 +890,9 @@ class RenderEditableContainerBox extends RenderBox
       }
       targetChild = childAfter(targetChild);
     }
-    assert(targetChild != null);
+    if (targetChild == null) {
+      throw ('targetChild should not be null');
+    }
     return targetChild;
   }