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"Value Cannot be NULL. Parameter name: key" error displayed against custom SmartObjects with hardcoded input properties post 5.1

This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice. This article is not considered official documentation for K2 software and is provided "as is" with no warranties.


This issue appears with custom SmartObjects that were built with input properties hardcoded. When executing methods post 5.1 upgrade, 'Value Cannot be NULL. Parameter name: key' error is displayed.


'Value Cannot be NULL. Parameter name: key' error is displayed when criteria in regards to custom SmartObjects having their input properties hardcoded when built is met.


This issue was resolved with Fixpack 3