Police said the crowd began to surge and rush toward the exit, possibly when they thought they heard gunshots.
However, there was "no evidence to support a shooting having occurred", Rochester police lieutenant Nicholas Adams told ABC News.
GloRilla, who had finished performing before the incident, said she was "devastated and heartbroken".
The Memphis musician, whose song F.N.F. (Let's Go) was nominated for best rap performance at last month's Grammy Awards, said she did not hear about the crush until she left the venue.