I used a workaround to fix this, delete the report along with the dataset from the web version. Then go in trough the desktop version and clear cache. Then re-publish and it worked for me.
We are having exactly the same problem when we try to pin some KPI or visualization in a Dashboard.
The problem was detected since today 17 January 2019 11h AM spanish hour and isn't fixed yet.
Could you tell us the status about this problem/bug? Are the engineers workingo on it? Do you know when it will be solved?
We have lounched 2 new APPS today and we need it to Monitorize the aplication.