方法实际入参为null时，NPE

[FGLInSHU]

Describe the bug

A clear and concise description of what the bug is.
方法实际入参为null时，NPE

Expected behavior

Actual behavior

Steps to reproduce

Minimal yet complete reproducer code (or GitHub URL to code)

Environment

• SOFATracer version:
• JVM version (e.g. java -version):
• OS version (e.g. uname -a):
• Maven version:
• IDE version: