To reproduce, for example:

1. In the analytics app, add an Adobe widget with the name Adobe "Unique Visitor" commonly used metrics and Unique visitors as the metric selected.
2. Clicked Add to dashboard, the demo dashboard disappears and an error is in the log (see txt file attached). The demo dashboard no longer appears in the dashboard dropdown.

Expected behavior: users should be prevented from using unauthorized characters in the name field.

Update : This bug can reproduce in Add new dashboard action as well