MTM test run becomes aborted randomly with error “Unexpected error occurred. Aborting run: Path cannot be null.

Question

I am having trouble with some test runs. They get aborted some of the times because there seems to be an issue with the path variable.
The following error is shown.
84 "02/13/2021 17:30:40" "Error saving the test results: Path cannot be null. Parameter name: path Will retry 0 time(s)."
85 "02/13/2021 17:30:40" "Test run [31077] completed."
86 "02/13/2021 17:30:40" "Unexpected error occurred. Aborting run: Path cannot be null. Parameter name: path"

Where can I configure this parameter? And if is not configured what is the mechanism that MTM publish the results. Thank you in advance