Vibration crashes, causes (?) lags when activating an app's top menu

Added some debug prints to PulleyMenuBase:

102     property bool quickSelect
103
104     onMenuItemChanged: {
105             console.assert(menuItem !== null, "MenuItem is null")
106             console.assert(menuItem === null, "menuItem not null: " + menuItem.objectName)
107     }
108
109     property real _inactiveHeight       // Height to show when the menu is inactive

gives (while the app is frozen):

file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:106  menuItem not null:
onMenuItemChanged (file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:106)
_highlightMenuItem (file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:374)
onMenuContentYChanged (file:///usr/lib64/qt5/qml/Sailfish/Silica/PullDownMenu.qml:153)
file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:105  MenuItem is null
onMenuItemChanged (file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:105)
onActiveChanged (file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:270)
_forceReposition (file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:688)
close (file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:440)
onVisibleChanged (file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:235)
file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:106  file:///usr/lib64/qt5/qml/Sailfish/Silica/private/P
ulleyMenuBase.qml:106: TypeError: Cannot read property 'objectName' of null

file:///usr/lib64/qt5/qml/Sailfish/Silica/private/PulleyMenuBase.qml:528  file:///usr/lib64/qt5/qml/Sailfish/Silica/private/P
ulleyMenuBase.qml:528: TypeError: Cannot call method 'earlyClick' of null