diff --git a/monaco-editor/website/playground/new-samples/extending-language-services/semantic-tokens-provider-example/sample.js b/monaco-editor/website/playground/new-samples/extending-language-services/semantic-tokens-provider-example/sample.js
index 75aa64b4..ec694261 100644
--- a/monaco-editor/website/playground/new-samples/extending-language-services/semantic-tokens-provider-example/sample.js
+++ b/monaco-editor/website/playground/new-samples/extending-language-services/semantic-tokens-provider-example/sample.js
@@ -110,6 +110,7 @@ monaco.languages.registerDocumentSemanticTokensProvider('plaintext', {
 monaco.editor.defineTheme('myCustomTheme', {
 	base: 'vs',
 	inherit: true,
+	colors : {},
 	rules: [
 		{ token: 'comment', foreground: 'aaaaaa', fontStyle: 'italic' },
 		{ token: 'keyword', foreground: 'ce63eb' },