1 files changed, 9 insertions, 7 deletions
diff --git a/src/bun.js/scripts/generate-jssink.js b/src/bun.js/scripts/generate-jssink.js
index ef60efbba..93bf842c4 100644
--- a/src/bun.js/scripts/generate-jssink.js
+++ b/src/bun.js/scripts/generate-jssink.js
@@ -636,17 +636,19 @@ void JS${controllerName}::detach() {
 
     auto readableStream = m_weakReadableStream.get();
     auto onClose = m_onClose.get();
-    m_onClose.clear();
     
     if (readableStream && onClose) {
-        JSC::JSGlobalObject *globalObject = this->globalObject();
         auto callData = JSC::getCallData(onClose);
-        JSC::MarkedArgumentBuffer arguments;
-        arguments.append(readableStream);
-        arguments.append(jsUndefined());
-        call(globalObject, onClose, callData, JSC::jsUndefined(), arguments);
+        if(callData.type != JSC::CallData::Type::None) {
+            JSC::JSGlobalObject *globalObject = this->globalObject();
+            JSC::MarkedArgumentBuffer arguments;
+            arguments.append(readableStream);
+            arguments.append(jsUndefined());
+            call(globalObject, onClose, callData, JSC::jsUndefined(), arguments);
+        }
     }
-    
+
+    m_onClose.clear();
     m_weakReadableStream.clear();
 }
 `;