1 files changed, 4 insertions, 2 deletions
diff --git a/src/corelib/io/qprocess_win.cpp b/src/corelib/io/qprocess_win.cpp
index 5c9db05eff..e77249975c 100644
--- a/src/corelib/io/qprocess_win.cpp
+++ b/src/corelib/io/qprocess_win.cpp
@@ -694,13 +694,15 @@ bool QProcessPrivate::waitForBytesWritten(int msecs)
             return true;
 
         // If we wouldn't write anything, check if we can read stdout.
-        if (bytesAvailableInChannel(&stdoutChannel) != 0) {
+        if (stdoutChannel.pipe[0] != INVALID_Q_PIPE
+                && bytesAvailableInChannel(&stdoutChannel) != 0) {
             tryReadFromChannel(&stdoutChannel);
             timer.resetIncrements();
         }
 
         // Check if we can read stderr.
-        if (bytesAvailableInChannel(&stderrChannel) != 0) {
+        if (stderrChannel.pipe[0] != INVALID_Q_PIPE
+                && bytesAvailableInChannel(&stderrChannel) != 0) {
             tryReadFromChannel(&stderrChannel);
             timer.resetIncrements();
         }