Steps: 1. Create a test case with two steps: - HTTP request with GET verb - Any non-http step (Verification, Set Varisble, Wait, GoTo or Coded Step) 2. Run the http request step as a single step (if the whole test is executed instead, the test run passes successfuly) 3. Run the second step too - also as a single step Result: The second step passes, but an error appears in the test output: "13:57:37.017 [ERROR] Unable to cast object of type 'System.String' to type 'System.Byte[]'." If the second step is a Set Variable step or a Coded Step that creates a runtime variable, the resulting runtime varible will fail to be created and will not be available if further test steps get executed. Expected behavior: The second step should pass with no errors and any runtime variable that it creates should be properly created and available for further test steps.