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runtime error: invalid memory address or nil pointer dereference (Maybe not a bug) #35310

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@fuboat

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Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

SET sql_mode="";
GRANT ALL PRIVILEGES ON *.* to '???';

2. What did you expect to see? (Required)

Query OK, 0 rows affected (0.00 sec)
ERROR 1410 (42000): You are not allowed to create a user with GRANT

3. What did you see instead (Required)

Query OK, 0 rows affected (0.00 sec)
ERROR 1105 (HY000): runtime error: invalid memory address or nil pointer dereference

4. What is your TiDB version? (Required)

Release Version: v6.2.0-alpha-97-g06737ecd2
Edition: Community
Git Commit Hash: 06737ecd29b0ae633d9ac89b0660e7a43939c88d
Git Branch: master
UTC Build Time: 2022-06-11 07:47:16
GoVersion: go1.18.2
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false
Store: unistore

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