I have tried to solve this issue without having success. It's strange becuase this the module that return teh issue is the replica of another one that works fine.
I have shared the folder on gitHub - I will be happy if somebody can help me to figure how to fix it.
Thank you so much P.
Use ? in interpolation object variable in your HTML Tag as shown below in the code.
It is shorthand to write as (card || {}).titleHeader
<h2>{{ card?.titleHeader }}</h2>