2018.5 crash when using VU effect

[brichi]

Hi guys, I have XLights crashing every time i do the following

1. add VU Meter effect to a prop
2. choose type - spectrogram
3. start messing with start and end note sliders and crash happens

here is a video i shot on my phone quick - https://youtu.be/CqQyJMr10R4
here are the crash files in the popup - https://drive.google.com/drive/folders/1YIINREMbNAzFez-W-MnPvItXmFRHswMg?usp=sharing