TypeError: this._fragment is null

[bwbroersma]

<!-- App.html -->
{{#if show}}
  <Nested bind:show/>
{{else}}
  <button on:click="set({show:true})">Show it</button>
{{/if}}
<script>
  import Nested from './Nested.html';
  export default {
    components: {
      Nested
    }
  };
</script>

<!-- Nested.html -->
<p>Nested component with button <button on:click="set({show:false})">Hide it</button></p>

(see REPL)

Now clicking "Hide it" will trigger TypeError: this._fragment is null in function _set(newState), which is called twice and the second time this._fragment is null.

[Rich-Harris]

Fixed in 1.41.4, thanks!