Internal Server Error when Upgrading V7 to V9

frappe@erpnext:~/frappe-bench$ bench --site erpnext.vm migrate
Migrating erpnext.vm
Executing execute:frappe.reload_doc(‘core’, ‘doctype’, ‘module_def’) #2017-09-22 in erpnext.vm (d56cb677eaab3383)
Traceback (most recent call last):
File “/usr/lib/python2.7/runpy.py”, line 162, in _run_module_as_main
main”, fname, loader, pkg_name)
File “/usr/lib/python2.7/runpy.py”, line 72, in _run_code
exec code in run_globals
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, lin e 94, in
main()
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, lin e 18, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/co re.py”, line 722, in call
return self.main(*args, **kwargs)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 697, in main
rv = self.invoke(ctx)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 535, in invoke
return callback(*args, **kwargs)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/decorators.py”, line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/commands/init.py”, line 24, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/commands/site.py”, line 217, in migrate
migrate(context.verbose, rebuild_website=rebuild_website)
File “/home/frappe/frappe-bench/apps/frappe/frappe/migrate.py”, line 31, in migrate
frappe.modules.patch_handler.run_all()
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 29, in run_all
if not run_single(patchmodule = patch):
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 63, in run_single
return execute_patch(patchmodule, method, methodargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 81, in execute_patch
exec(patchmodule.split(“execute:”)[1],globals())
File “”, line 1, in
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 691, in reload_doc
return frappe.modules.reload_doc(module, dt, dn, force=force, reset_permissions=reset_permissions)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/utils.py”, line 146, in reload_doc
return import_files(module, dt, dn, force=force, reset_permissions=reset_permissions)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/import_file.py”, line 19, in import_files
reset_permissions=reset_permissions)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/import_file.py”, line 24, in import_file
ret = import_file_by_path(path, force, pre_process=pre_process, reset_permissions=reset_permissions)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/import_file.py”, line 58, in import_file_by_path
ignore_version=ignore_version, reset_permissions=reset_permissions)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/import_file.py”, line 131, in import_doc
doc.insert()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 237, in insert
d.db_insert()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 299, in db_insert
), list(d.values()))
File “/home/frappe/frappe-bench/apps/frappe/frappe/database.py”, line 152, in sql
self._cursor.execute(query, values)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/MySQLdb/cursors.py”, line 250, in execute
self.errorhandler(self, exc, value)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/MySQLdb/connections.py”, line 50, in defaulterrorhandler
raise errorvalue
_mysql_exceptions.OperationalError: (1048, “Column ‘is_custom’ cannot be null”)
frappe@erpnext:~/frappe-bench$

Try this: