Hi Fabrizio,
Thank you for your interest in Syncfusion products.
I am afraid that I am unable to reproduce the issue reported by you. I have prepared a sample to check this issue in v9.1.0.21. But, still the reported issue is not reproduced in our end. I have also attached the prepared sample for your reference. Kindly download the sample from the following link,
98708-RTE405160963.zipIf the issue exists still could you please provide some more details on the error information like in what scenario you would get this error?
Kindly provide the details so that we could analyze more on this and provide you the solution in an efficient way.
Regards,
Varalakshmi.R.S