Qt Creator crashes when hovering over a qstring.h function (eg. .ToDouble())

The Qt creator installed on my Arch Linux crashes as soon as the mouse hovers long enough above the mentioned functions to trigger the help window.  Calling the help window using F1 works though. Strg-LMouse also works.

Usually
"ConnectionServer error: "QLocalSocket: Remote closed" "/tmp/QtCreator-KaMIXC/ClangBackEnd-81337"
Segmentation fault"
is all I get as information on it, in one specific case I also got this before crashing:

"QWidget::setMaximumSize: (/QLabel) Negative sizes (-8,16777215) are not possible
QWidget::setMaximumSize: (/QLabel) Negative sizes (-8,16777215) are not possible
ConnectionServer error: "QLocalSocket: Remote closed" "/tmp/QtCreator-MqJVGy/ClangBackEnd-55999"
Segmentation fault" which is written during each keystroke when completion suggestion is  active. The code suggestion window successfully opens in this case and does not crash the creator. Might be two seperate issues. 

Attached is a picture of how it should look without crashing.

Apart from a fix, does anybody know how to deactivate help upon mouse hovering as a workaround for now?

Thanks in advance