--- a/src/eric7/UI/UserInterface.py Wed Nov 30 16:20:18 2022 +0100 +++ b/src/eric7/UI/UserInterface.py Thu Dec 01 10:16:58 2022 +0100 @@ -5547,9 +5547,10 @@ elif self.__layoutType == "Sidebars": self.leftSidebar.show() self.leftSidebar.setCurrentWidget(self.projectBrowser) - self.projectBrowser.currentWidget().setFocus( - Qt.FocusReason.ActiveWindowFocusReason - ) + if self.projectBrowser.currentWidget() is not None: + self.projectBrowser.currentWidget().setFocus( + Qt.FocusReason.ActiveWindowFocusReason + ) def __activateMultiProjectBrowser(self): """