Null Pointer Exception in C++ files

#include <iostream>
using namespace std;

int main(int argc, char** argv) {
    std:: //<-- error point
    
    return 0;
}

When I typing std::, following error message always pop ups.

NullPointerException at org.netbeans.modules.cnd.completion.cplusplus.ext.CsmCompletionQuery$Context.findAutoOrDecltypeAutoType

I tested it in Build 201801230002 and g++ 7.2.0.

Edited(2018.05.08)
When I type 'class', suddenly java.lang.NullPointerException error is occurred.
I attached log.text file about this issue.