follow-up fix to #2871

src/compiler/compile/render-dom/wrappers/Element/index.ts

@@ -775,10 +775,12 @@ export default class ElementWrapper extends Wrapper {
 			${rect} = ${this.var}.getBoundingClientRect();
 		`);
 
+		const prepare_outro = outro ? `@prepare_outro(${this.var}, ${rect})` : ``;
 		block.builders.fix.add_block(deindent`
 			@fix_position(${this.var});
 			${stop_animation}();
-		` + (outro ? `@prepare_outro(${this.var}, ${rect})` : ``));
+			${prepare_outro}
+		`);
 
 		const params = this.node.animation.expression ? this.node.animation.expression.render(block) : '{}';