diff --git a/src/core/qsavefile.cpp b/src/core/qsavefile.cpp
index 24753500..bddf18c9 100644
--- a/src/core/qsavefile.cpp
+++ b/src/core/qsavefile.cpp
@@ -279,7 +279,10 @@ bool QSaveFile::commit()
     Q_D(QSaveFile);
     if (!d->tempFile)
         return false;
-    Q_ASSERT(isOpen());
+    if (!isOpen()) {
+        qWarning("QSaveFile::commit: File (%s) is not open", qPrintable(fileName()));
+        return false;
+    }
     QIODevice::close(); // flush and close
     if (d->error != QFile::NoError) {
         d->tempFile->remove();