1 files changed, 2 insertions, 2 deletions
diff --git a/src/widgets/widgets/qcombobox.cpp b/src/widgets/widgets/qcombobox.cpp
index 51e23ca7f9..af178ce8f5 100644
--- a/src/widgets/widgets/qcombobox.cpp
+++ b/src/widgets/widgets/qcombobox.cpp
@@ -2108,9 +2108,9 @@ void QComboBoxPrivate::setCurrentIndex(const QModelIndex &mi)
     if (lineEdit) {
         const QString newText = itemText(normalized);
         if (lineEdit->text() != newText) {
-            lineEdit->setText(newText);
+            lineEdit->setText(newText); // may cause lineEdit -> nullptr (QTBUG-54191)
 #ifndef QT_NO_COMPLETER
-            if (lineEdit->completer())
+            if (lineEdit && lineEdit->completer())
                 lineEdit->completer()->setCompletionPrefix(newText);
 #endif
         }