Tests_ApplicationWindow::test_defaultContentItemConstraints(height) crashes on SLES 12 & 15

agent:2019/03/24 13:59:09 build.go:192: QDEBUG : qtquickcontrols::Tests_ApplicationWindow::test_defaultContentItemConstraints(height) [     0.276 D] qt.qml.diskcache QQmlTypeData::tryLoadFromDiskCache - Error loading "" from disk cache: "File has to be a local file."
agent:2019/03/24 13:59:09 build.go:192: QDEBUG : qtquickcontrols::Tests_ApplicationWindow::test_defaultContentItemConstraints(height) [     0.286 D] qt.qml.diskcache QQmlTypeData::compile - Error saving cached version of "" to disk: "Missing time stamp for source file"
agent:2019/03/24 13:59:09 build.go:192: QFATAL : qtquickcontrols::Tests_ApplicationWindow::test_defaultContentItemConstraints(height) [     0.287 F] default unknown - ASSERT failure in QVector<T>::at: "index out of range", file ../../include/QtCore/../../src/corelib/tools/qvector.h, line 429
agent:2019/03/24 13:59:09 build.go:192: FAIL!  : qtquickcontrols::Tests_ApplicationWindow::test_defaultContentItemConstraints(height) Received a fatal error.
agent:2019/03/24 13:59:09 build.go:192:    Loc: [Unknown file(0)]