diff --git a/packages/astro/src/core/render/slots.ts b/packages/astro/src/core/render/slots.ts
index f79f647481b2..f6d469b2a704 100644
--- a/packages/astro/src/core/render/slots.ts
+++ b/packages/astro/src/core/render/slots.ts
@@ -8,7 +8,7 @@ import type { Logger } from '../logger/core.js';
 
 function getFunctionExpression(slot: any) {
 	if (!slot) return;
-	const expressions = slot?.expressions.filter((e: unknown) => isRenderInstruction(e) === false);
+	const expressions = slot?.expressions?.filter((e: unknown) => isRenderInstruction(e) === false);
 	if (expressions?.length !== 1) return
 	return expressions[0] as (...args: any[]) => any;
 }