Hi Roberto,
Greetings from Syncfusion.
We would like to let you know that the reported crash issue with SfComboBox (System Version Crash) is a known issue and we have already fixed the same. Please upgrade to the latest Syncfusion NuGet 17.3.0.26 to resolve the issue from your side.
If the mentioned issue differs from the above, please modify the above sample with the replication steps or complete stack trace which will help us to further analyze and provide an appropriate solution.
Regards,
Hemalatha M.