Hi Tomas,
Thank you for contacting Syncfusion support.
Based on your provided code snippet we have analyzed the issue “Java.Lang.IllegalArgumentException”. Due to the unavailability of the specified device as you have mentioned so we have checked the issue with similar device Huawei 9N and Redmi Note 4 in that we have performed a continues open and close the popup as much but we could not able to replicate the issue in our end. Meanwhile, we also configure the simulator as you have mentioned in the image to check the issue.
Please refer the sample and video,
Note: Issue has been checked with Xamarin. Forms version 3.6.0.344 and Syncfusion NuGet version 17.3.0.14
Please check the sample and let us know if you still facing the same issue? If not, please modify the sample based on your scenario and revert us with the more details, so that it will be helpful for us to check on it and provide you the solution at the earliest.
Regards,
Balasubramani Sundaram