[twisty] Add guard against uninitializer wrapper in background setter.

cubing · Aug 16, 2020 · b0ed176 · b0ed176
1 parent 6ee7077
commit b0ed176
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/twisty/dom/TwistyPlayer.ts b/src/twisty/dom/TwistyPlayer.ts
@@ -130,7 +130,9 @@ export class TwistyPlayer extends ManagedCustomElement {
 
   set background(background: BackgroundTheme) {
     this.#config.attributes["background"].setValue(background);
-    this.#viewerWrapper.checkered = background === "checkered";
+    if (this.#viewerWrapper) {
+      this.#viewerWrapper.checkered = background === "checkered";
+    }
   }
 
   get background(): BackgroundTheme {