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ComboBox crashing app when tapped

I have a problem that has suddenly started. All the comboboxes in my app cause the app to crash when they are tapped. On iOS only, not Android. SF version 29.1.41, but it also happened with an earlier version.

If I'm debugging through Visual Studio then I get the following error when the app crashes:

System.MissingMethodException: 'Method not found: System.Collections.Generic.IEnumerator1<!0> Foundation.NSSet1.GetEnumerator()'

This is not just my device, my app users are also reporting it.

You can click the 'X' clear button, but clicking anywhere else in the combobox is an immediate crash.

Does anyone have any ideas where I can start looking?


1 Reply
KP Kamalesh Periyasamy Syncfusion Team May 13, 2025 11:28 AM UTC

Hi Graeme, 
 
Thank you for reaching out to us. 
We have reviewed the reported issue regarding the SfComboBox control causing the app to crash on iOS when tapped. However, we were unable to reproduce the crash in our testing environment using the same Syncfusion version (v29.1.41). 
 
To assist you further, we have attached a tested sample and a video demo for your reference. Kindly try running this sample on your side and let us know if you encounter the same issue. 
 
If the issue still occurs in your application, we kindly request the following details to help us investigate further: 

  • A reproducible sample project (or a modified version of our sample) that demonstrates the issue along with issue demo. 
  • The exact iOS version and device model(s) where the crash occurs, as well as the Syncfusion version where it was working fine previously. 
  • The full stack trace or crash log if available 

This information will greatly help us pinpoint the root cause and provide a resolution as quickly as possible. 

We look forward to your response. 
 
Regards, 
Kamalesh P 


Attachment: ComboBoxSample_a6850b20.zip

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