only sort if it has a value

Author: nielslyngsoe

src/libs/observable-api/states/array-state.ts

@@ -35,7 +35,10 @@ export class UmbArrayState<T> extends UmbDeepState<T[]> {
 	 */
 	sortBy(sortMethod?: (a: T, b: T) => number) {
 		this.#sortMethod = sortMethod;
-		super.setValue([...this.getValue()].sort(this.#sortMethod));
+		const value = this.getValue();
+		if(value) {
+			super.setValue([...value].sort(this.#sortMethod));
+		}
 		return this;
 	}