yarp logger crashes when clearing current log

[S-Dafarra]

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Describe the bug When clicking on "Clear current log", the logger suddenly closes.

To Reproduce Open the logger. When a series of entries are listed in the logger, if you click on "Clear current log", it crashes

Expected behavior The entries in the log should disappear, but the logger application should remain open.

Screenshots

https://user-images.githubusercontent.com/18591940/106135910-d3a17900-6168-11eb-8b14-818b6735d255.mp4

Configuration (please complete the following information):

• OS: Ubuntu 18.04
• yarp version: 3.4.100+20201020.2+gitaf2a17ded
• compiler: gcc 7.5.0

Additional context It seems to happen only if there are several entries