diff --git a/lib/src/html/dom/element_subclasses.dart b/lib/src/html/dom/element_subclasses.dart
index 9a8628e..cebc60d 100644
--- a/lib/src/html/dom/element_subclasses.dart
+++ b/lib/src/html/dom/element_subclasses.dart
@@ -2755,7 +2755,7 @@ class StyleElement extends HtmlElement {
       return null;
     }
     final text = this.text;
-    final parsed = css.parse(text as String);
+    final parsed = css.parse(text ?? '');
     final styleSheet = CssStyleSheet.constructor();
     for (var node in parsed.topLevels) {
       if (node is css.RuleSet) {