For example Array to string conversion in DrupalDefaultEntityController->cacheGet()
Is it on topic here? Should it be exception, as stefgosselin says? Why was it reopened, when it clearly does not meet neither requirements from help center, nor any positive score answer to meta question Can a question about a module bug ever become on topic for Drupal Answers?
What are the rules about bug questions now, to allow this one to be open?
Kiamlaluno ♦ said here:
What we are really trying to avoid are those questions where the OP simply reports a warning or an error message shown by a module implemented by others, and asks what to do.