Internal Server Error: Value cannot be null. Parameter name: key

Hello Max,

You are correct about the issue in the Q1 2015 SP1 version of Telerik Reporting. The described behavior is a known issue in Q1 2015 SP1 which is exhibited when you use a PictureBox item with an expression which cannot be evaluated to a valid image, or is without a value/has a null value.

The issue has been fixed in the latest available Telerik Reporting internal build - 9.0.15.422 (download link). Please download and install the internal build to resolve the issue.

Regards,
Nasko
Telerik