diff --git a/.changeset/clear-pans-nail.md b/.changeset/clear-pans-nail.md
new file mode 100644
index 00000000..b0895a6f
--- /dev/null
+++ b/.changeset/clear-pans-nail.md
@@ -0,0 +1,5 @@
+---
+'@openai/agents-core': patch
+---
+
+fix: ensure process.on exists and is a function before adding event handlers
diff --git a/packages/agents-core/src/index.ts b/packages/agents-core/src/index.ts
index 1a457f1c..80101f76 100644
--- a/packages/agents-core/src/index.ts
+++ b/packages/agents-core/src/index.ts
@@ -153,7 +153,7 @@ const cleanup = async () => {
   await getGlobalTraceProvider().shutdown();
 };
 
-if (typeof process !== 'undefined') {
+if (typeof process !== 'undefined' && typeof process.on === 'function') {
   // handling Node.js process termination
 
   // Handle normal termination
diff --git a/packages/agents-core/src/tracing/index.ts b/packages/agents-core/src/tracing/index.ts
index 7869699f..a50e6932 100644
--- a/packages/agents-core/src/tracing/index.ts
+++ b/packages/agents-core/src/tracing/index.ts
@@ -52,7 +52,7 @@ const cleanup = async () => {
   await getGlobalTraceProvider().shutdown();
 };
 
-if (typeof process !== 'undefined') {
+if (typeof process !== 'undefined' && typeof process.on === 'function') {
   // handling Node.js process termination
 
   // Handle normal termination