fix

packages/svelte/src/internal/client/render.js

@@ -1542,7 +1542,7 @@ function swap_block_dom(block, from, to) {
 /**
  * @param {Comment} anchor_node
  * @param {() => string} tag_fn
- * @param {null | ((element: Element, anchor: Node) => void)} render_fn
+ * @param {undefined | ((element: Element, anchor: Node) => void)} render_fn
  * @param {any} is_svg
  * @returns {void}
  */
@@ -1582,7 +1582,7 @@ export function element(anchor_node, tag_fn, render_fn, is_svg = false) {
 				block.d = null;
 			}
 			element = next_element;
-			if (element !== null && render_fn !== null) {
+			if (element !== null && render_fn !== undefined) {
 				let anchor;
 				if (current_hydration_fragment !== null) {
 					// Use the existing ssr comment as the anchor so that the inner open and close

packages/svelte/tests/snapshot/samples/svelte-element/_expected/client/index.svelte.js

@@ -1,4 +1,4 @@
-// index.svelte (Svelte v5.0.0-next.13)
+// index.svelte (Svelte VERSION)
 // Note: compiler output will change before 5.0 is released!
 import "svelte/internal/disclose-version";
 import * as $ from "svelte/internal";
@@ -14,4 +14,4 @@ export default function Svelte_element($$anchor, $$props) {
 	$.element(node, () => $.get(tag));
 	$.close_frag($$anchor, fragment);
 	$.pop();
-}
+}

packages/svelte/tests/snapshot/samples/svelte-element/_expected/server/index.svelte.js

@@ -1,4 +1,4 @@
-// index.svelte (Svelte v5.0.0-next.13)
+// index.svelte (Svelte VERSION)
 // Note: compiler output will change before 5.0 is released!
 import * as $ from "svelte/internal/server";
 
@@ -24,4 +24,4 @@ export default function Svelte_element($$payload, $$props) {
 	$$payload.out += `${anchor}`;
 	$.bind_props($$props, { tag });
 	$.pop();
-}
+}