Fix #1392: UnhandledFlutterException: Null check operator used on a null value in Container.insert(container.dart:127)

CHANGELOG.md

@@ -1,3 +1,6 @@
+# [7.4.4]
+- Fix #1392.
+
 # [7.4.4]
 - Fix #1311.
 

lib/src/models/documents/nodes/container.dart

@@ -108,9 +108,7 @@ abstract class Container<T extends Node?> extends Node {
     Iterable<EmbedBuilder>? embedBuilders,
     EmbedBuilder? unknownEmbedBuilder,
   ]) =>
-      children
-          .map((e) => e.toPlainText(embedBuilders, unknownEmbedBuilder))
-          .join();
+      children.map((e) => e.toPlainText(embedBuilders, unknownEmbedBuilder)).join();
 
   /// Content length of this node's children.
   ///
@@ -124,15 +122,15 @@ abstract class Container<T extends Node?> extends Node {
 
     if (isNotEmpty) {
       final child = queryChild(index, false);
-      child.node!.insert(child.offset, data, style);
-      return;
+      if (child.isNotEmpty) {
+        child.node!.insert(child.offset, data, style);
+      }
+    } else {
+      assert(index == 0);
+      final node = defaultChild;
+      add(node);
+      node?.insert(index, data, style);
     }
-
-    // empty
-    assert(index == 0);
-    final node = defaultChild;
-    add(node);
-    node?.insert(index, data, style);
   }
 
   @override

pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_quill
 description: A rich text editor built for the modern Android, iOS, web and desktop platforms. It is the WYSIWYG editor and a Quill component for Flutter.
-version: 7.4.4
+version: 7.4.5
 homepage: https://1o24bbs.com/c/bulletjournal/108
 repository: https://github.com/singerdmx/flutter-quill