Helper B.5 Frequency Estimation - Segfault on wrong "decim" value

[alexxcons]

I would expect an error at startup with clear error message instead od a runtime crash

Currently dont have a backtrace ... here the settings to reproduce:

Signal in: 31,25MS/s streaming mode.

Settings for Block "Helper B.5 Frequency Estimation":

Samp Rate: 31.25M
Sig.Avg.Window: 10
Freq. Est AVG Window: 1000
Decim: 5

With a decim of 3125 things work fine (resulting in 10kS/s on the output)