#vulnerable code 
                                public boolean getBooleanSetting(String key) {
        Boolean result = null;
        if (this.getSettings().containsKey(key)) {
            Object foo = this.getSettings().get(key);
            if (foo instanceof String) {
                result = Boolean.valueOf((String)foo);
            } else if (foo instanceof Boolean) {
                result = (Boolean)foo;
            }
        }
        return result;
    } 
                            #location 11 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public boolean getBooleanSetting(String key) {
        Boolean result = null;
        if (this.getSettings().containsKey(key)) {
            Object foo = this.getSettings().get(key);
            if (foo instanceof String) {
                result = Boolean.valueOf((String)foo);
            } else if (foo instanceof Boolean) {
                result = (Boolean)foo;
            }
        }
        return result != null ? result : false;
    }