1. Add contact -> Enter one space char each for "first name" and "last name".
2. fill out the other fields (corporation name, email)
3. "save changes" -> Error: An error occurred while executing an action.
-> see attached error log
after that I could not save the contact even if I enter a "good" name:
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4. enter a real name in "first name" and "last name" after the first error
5. "save changes" -> Error: An error occurred while executing an action.
-> see NullPointerException in error log.
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I was using a space for personal name, because I wanted to enter a main company address not related to a person.