iOS原生通过boost跳转到flutter页面后弹出showCupertinoModalPopup报错

[✓] Flutter (Channel stable, 2.5.3, on macOS 11.6.1 20G224 darwin-x64, locale zh-Hans-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
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[✓] Xcode - develop for iOS and macOS
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[✓] Android Studio (version 2020.3)
[✓] VS Code (version 1.63.1)
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! Doctor found issues in 1 category.

这是flutter版本，对应flutter_boost是1.17.1。
复现步骤是用boost open到一个flutter页面A，close后，再次打开页面A，点击出现弹框。我这里可以提供可复现的最小demo，如需可提供

如下是部分弹框代码：
如下是报错信息：

Start with the reported Flutter 2.5.3 and flutter_boost 1.17.1 setup on iOS. Reproduce the flow of opening page A through Boost, closing it, reopening it, and invoking showCupertinoModalPopup; use the attached error report and request the offered minimal demo if reproduction is blocked. Done means the popup opens without the reported error after the page is reopened.

Written by the indexing model from the issue text.