diff --git a/source/sse-session/sse-session.ts b/source/sse-session/sse-session.ts
index c1dd20c..7ff1719 100644
--- a/source/sse-session/sse-session.ts
+++ b/source/sse-session/sse-session.ts
@@ -267,7 +267,7 @@ export class SSESession extends EventEmitter<SSESessionEventMap> {
         const fetchOptions: RequestInit = {
             method,
             headers: headers || {},
-            body: fetchBody,
+            body: fetchBody ?? null,
             signal: controller.signal,
             cache: 'no-store',
         };