this is a crash ， "exp_reason" : "*** -[NSPlaceholderString initWithUTF8String:]: NULL cString",

[canran]

• 4 PCDBank CStackHighSpeedLogger::CStackHighSpeedLogger() (in PCDBank) +68
• 5 PCDBank CStacksHashmap::CStacksHashmap() (in PCDBank) +76
• 6 PCDBank COOMDetector::startVMStackMonitor() (in PCDBank) +80