diff --git a/.changeset/eight-rice-tap.md b/.changeset/eight-rice-tap.md
new file mode 100644
index 0000000000..f31d24115c
--- /dev/null
+++ b/.changeset/eight-rice-tap.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/partytown': patch
+---
+
+Prevent Partytown integration from inserting a 'null' string into the body
diff --git a/packages/integrations/partytown/src/index.ts b/packages/integrations/partytown/src/index.ts
index 739ff0e4b9..05a1b4c115 100644
--- a/packages/integrations/partytown/src/index.ts
+++ b/packages/integrations/partytown/src/index.ts
@@ -26,7 +26,7 @@ export default function createPlugin(options?: PartytownOptions): AstroIntegrati
 		hooks: {
 			'astro:config:setup': ({ config: _config, command, injectScript }) => {
 				const lib = `${appendForwardSlash(_config.base)}~partytown/`;
-				const recreateIFrameScript = `;(e=>{e.addEventListener("astro:before-swap",e=>{let r=document.body.querySelector("iframe[src*='${lib}']");e.newDocument.body.append(r)})})(document);`;
+				const recreateIFrameScript = `;(e=>{e.addEventListener("astro:before-swap",e=>{let r=document.body.querySelector("iframe[src*='${lib}']");if(r)e.newDocument.body.append(r)})})(document);`;
 				const partytownConfig = {
 					lib,
 					...options?.config,