packages/wyatt_ui_components/lib/src/domain/entities/rich_text_builder/parser.dart

@@ -23,7 +23,7 @@ class RichTextStyleParameter {
     this.styleName,
   );
 
-  final TextStyle defaultStyle;
+  final TextStyle? defaultStyle;
   final Map<String, TextStyle> definedStyle;
   final String? styleName;
 
@@ -31,7 +31,7 @@ class RichTextStyleParameter {
     if (definedStyle.containsKey(styleName)) {
       return definedStyle[styleName]!;
     }
-    return defaultStyle;
+    return defaultStyle ?? const TextStyle();
   }
 
   RichTextStyleParameter copyWith({

packages/wyatt_ui_kit/lib/src/components/rich_text_builder/rich_text_builder.dart

@@ -59,7 +59,7 @@ class RichTextBuilder extends RichTextBuilderComponent
       text ?? '',
       regex,
       RichTextStyleParameter(
-        style.defaultStyle!,
+        style.defaultStyle,
         style.styles ?? {},
         null,
       ),