Crash of Steca with StressSpec TestData

To reproduce: start Steca without multi threading then load the following data files https://computing.mlz-garching.de/download/testdata/steca/StressSpec/test/; mark φ in Meta Data; fit the Peak and then click on tab table. As soon as the tab is clicked Steca crashed on my system

Notes:

• This crash does not happen when Steca is started with multi threading option -j 1 (and this data set)
• This crash has also not been observed (from my end so far) for other datasets regardless whether multi threading option is used or not