fix: type assert crash

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 65.80%. Comparing base (1c80b9c) to head (5a936a6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7639 +/- ## ========================================== + Coverage 65.76% 65.80% +0.03% ========================================== Files 353 353 Lines 42812 42812 ========================================== + Hits 28156 28173 +17 + Misses 12180 12167 -13 + Partials 2476 2472 -4 ``` | [Flag](https://app.codecov.io/gh/apecloud/kubeblocks/pull/7639/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apecloud) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/apecloud/kubeblocks/pull/7639/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apecloud) | `65.80% <ø> (+0.03%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apecloud#carryforward-flags-in-the-pull-request-comment) to find out more.

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[xuriwuyun]

/cherry-pick release-0.9

[github-actions[bot]]

🤖 says: cherry pick action finished successfully 🎉!
See: https://github.com/apecloud/kubeblocks/actions/runs/9675634069