phpstorm调试的时候Variables里增加一个空对象表达式，再一次调试就会报错。

[euii]

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1. What did you do? If possible, provides a simple script and debug step to reproduce the problem.

phpstorm调试的时候Variables里增加一个空对象表达式，再一次调试就会报错。

2. What did you expect to see?

3. What did you see instead?

0.3.8

4. What is your machine environment used (show your uname -a & php -v & gcc -v) ?

uname -a
Darwin MacBook-Pro.lan 20.6.0 Darwin Kernel Version 20.6.0: Wed Jun 23 00:26:27 PDT 2021; root:xnu-7195.141.2~5/RELEASE_ARM64_T8101 arm64

php -v
PHP 7.3.26 (cli) (built: Feb  1 2021 03:36:59) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.26, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.3.26, Copyright (c) 1999-2018, by Zend Technologies
    with Yasd v0.3.8, Our Copyright, by codinghuang

gcc -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 12.0.5 (clang-1205.0.22.11)
Target: arm64-apple-darwin20.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin