1 files changed, 7 insertions, 0 deletions
diff --git a/src/corelib/io/qwinoverlappedionotifier.cpp b/src/corelib/io/qwinoverlappedionotifier.cpp
index 8f4b8be9a3..7ba862c602 100644
--- a/src/corelib/io/qwinoverlappedionotifier.cpp
+++ b/src/corelib/io/qwinoverlappedionotifier.cpp
@@ -122,6 +122,8 @@ public:
         mutex.unlock();
     }
 
+    using QThread::isRunning;
+
 protected:
     void run()
     {
@@ -216,6 +218,11 @@ void QWinOverlappedIoNotifier::setEnabled(bool enabled)
  */
 bool QWinOverlappedIoNotifier::waitForNotified(int msecs, OVERLAPPED *overlapped)
 {
+    if (!iocp->isRunning()) {
+        qWarning("Called QWinOverlappedIoNotifier::waitForNotified on inactive notifier.");
+        return false;
+    }
+
     forever {
         DWORD result = WaitForSingleObject(hSemaphore, msecs == -1 ? INFINITE : DWORD(msecs));
         if (result == WAIT_OBJECT_0) {