Cannot export ISA-JSON after adding SOP TYPE

[floradanna]

Describe the bug
Cannot export ISA-JSON after adding SOP TYPE. Even if the SOP Type ontology value has been removed, it is still not possible to export ISA-JSON because of an error

To Reproduce
Steps to reproduce the behavior:

1. Go to https://datahub-test.elixir-belgium.org/single_pages/86#investigation-80
2. Click on Export ISA
3. See error

Expected behavior
Be able to export ISA-JSON always, even after trying to add SOP Type metadata

Screenshots

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. edge]

[kdp-cloud]

@floradanna
There is a mismatch between the value in the sample and the SOP title.

Can you try removing the protocol and linking the correct protocol to it like this:

And see if the problem persists?