From e12a8436926cd10937ff03463d5b8cc8bd16b852 Mon Sep 17 00:00:00 2001
From: "Guilherme C. Matuella" <guilherme1matuella@gmail.com>
Date: Fri, 23 Apr 2021 18:35:26 -0300
Subject: [PATCH] Adds `doc.isEmpty` check to `Document._loadDocument(Delta
 doc)`

---
 lib/models/documents/document.dart | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/models/documents/document.dart b/lib/models/documents/document.dart
index 83f7a0fc..68dbee4d 100644
--- a/lib/models/documents/document.dart
+++ b/lib/models/documents/document.dart
@@ -223,7 +223,12 @@ class Document {
   String toPlainText() => _root.children.map((e) => e.toPlainText()).join();
 
   void _loadDocument(Delta doc) {
+    if (doc.isEmpty) {
+      throw ArgumentError.value(doc, 'Document Delta cannot be empty.');
+    }
+
     assert((doc.last.data as String).endsWith('\n'));
+
     var offset = 0;
     for (final op in doc.toList()) {
       if (!op.isInsert) {