robustify bind:currentTime - fixes #3524

src/compiler/compile/render_dom/wrappers/Element/index.ts

@@ -472,8 +472,10 @@ export default class ElementWrapper extends Wrapper {
 					function ${handler}() {
 						${animation_frame && deindent`
 						@_cancelAnimationFrame(${animation_frame});
-						if (!${this.var}.paused) ${animation_frame} = @raf(${handler});`}
-						${needs_lock && `${lock} = true;`}
+						if (!${this.var}.paused) {
+							${animation_frame} = @raf(${handler});`}
+							${needs_lock && `${lock} = true;`}
+						}
 						ctx.${handler}.call(${this.var}${contextual_dependencies.size > 0 ? ', ctx' : ''});
 					}
 				`);