django.db.utils.OperationalError when remove the parent model

[Cheng-Hung Hsueh]

My original models like this

class A(models.Model):
    data = models.CharField(max_length=30)

class B(models.Model):
    pass

Make migrations, then I modified the artitecture

class A(models.Model):
    data = models.CharField(max_length=30)

class B(models.Model):
    pass

Make migration and migrate.

get the error:

  File 
"/..../lib/python3.4/site-packages/django/db/backends/sqlite3/base.py", 
line 323, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: near ")": syntax error

Is it a bug?

Env:
django 1.10.1

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