С++ вызывает статическую функцию из другой статической функции

иметь статическую функцию в заголовочном файле

    class Diagnostics {
    public:


    static void functionA(){
    }

    static void functionB(){
    some code //works fine until enters the loop below
    variable_name // works fine here.
    if (condition){ // 
    variable_name; // after condition is met , i step in here, debugger cannot examine
                   // the vairable_name which was fine above. right after i try to step                      over , i get SIGSEV error
    some_code; // doesnt even come here. Process exited with SIGSEV
    function C(); // tried using classname::functionC , didnt work either

        }
    }

static void functionC(){
}