check for existence of switch instance before introing - fixes #3054

sveltejs · Jun 25, 2019 · f2044c4 · f2044c4
1 parent 35001b3
commit f2044c4
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Showing 3 changed files with 13 additions and 1 deletion.
diff --git a/src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts b/src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts
@@ -447,7 +447,7 @@ export default class InlineComponentWrapper extends Wrapper {
 			`);
 
 			block.builders.intro.add_block(deindent`
-				@transition_in(${name}.$$.fragment, #local);
+				if (${name}) @transition_in(${name}.$$.fragment, #local);
 			`);
 
 			if (updates.length) {

diff --git a/test/runtime/samples/dynamic-component-nulled-out-intro/_config.js b/test/runtime/samples/dynamic-component-nulled-out-intro/_config.js
@@ -0,0 +1,5 @@
+export default {
+	test({ component }) {
+		component.visible = true;
+	}
+};
diff --git a/test/runtime/samples/dynamic-component-nulled-out-intro/main.svelte b/test/runtime/samples/dynamic-component-nulled-out-intro/main.svelte
@@ -0,0 +1,7 @@
+<script>
+	export let visible = false;
+</script>
+
+{#if visible}
+	<svelte:component this={null}/>
+{/if}