diff --git a/myenv/lib/python3.12/site-packages/urllib3/contrib/emscripten/emscripten_fetch_worker.js b/myenv/lib/python3.12/site-packages/urllib3/contrib/emscripten/emscripten_fetch_worker.js
index 243b862..0feac23 100644
--- a/myenv/lib/python3.12/site-packages/urllib3/contrib/emscripten/emscripten_fetch_worker.js
+++ b/myenv/lib/python3.12/site-packages/urllib3/contrib/emscripten/emscripten_fetch_worker.js
@@ -12,10 +12,18 @@ const encoder = new TextEncoder();
 self.addEventListener("message", async function (event) {
   if (event.data.close) {
     let connectionID = event.data.close;
+    if (connectionID === '__proto__' || connectionID === 'constructor' || connectionID === 'prototype') {
+      console.error("Invalid connectionID");
+      return;
+    }
     delete connections[connectionID];
     return;
   } else if (event.data.getMore) {
     let connectionID = event.data.getMore;
+    if (connectionID === '__proto__' || connectionID === 'constructor' || connectionID === 'prototype') {
+      console.error("Invalid connectionID");
+      return;
+    }
     let { curOffset, value, reader, intBuffer, byteBuffer } =
       connections[connectionID];
     // if we still have some in buffer, then just send it back straight away