Program: 19067
Project: 19067
Buggy source:
/** 
 * Set the activity title & header image. <p> If the user is browsing a single track then it's name is shown as the title and a relevant header image; otherwise a generic title and image is shown.
 */
private void setHeader(){
  if (mMode == MODE_EXPLORE && mTagMetadata != null) {
    String tag=getIntent().getStringExtra(EXTRA_FILTER_TAG);
    TagMetadata.Tag titleTag=tag == null ? null : mTagMetadata.getTag(tag);
    String title=null;
    String headerImage=null;
    int trackColor=0;
    if (titleTag != null && mTagFilterHolder.getCountByCategory(titleTag.getCategory()) == 1) {
      for (      String tagId : mTagFilterHolder.getSelectedFilters()) {
        TagMetadata.Tag theTag=mTagMetadata.getTag(tagId);
        if (TextUtils.equals(titleTag.getCategory(),theTag.getCategory())) {
          title=theTag.getName();
          headerImage=theTag.getPhotoUrl();
          trackColor=theTag.getColor();
          break;
        }
      }
    }
    if (title == null) {
      title=getString(R.string.title_explore);
    }
    mTitle.setText(title);
    if (headerImage != null) {
      mHeaderImage.setScaleType(ImageView.ScaleType.CENTER_CROP);
      mImageLoader.loadImage(headerImage,mHeaderImage);
    }
 else {
      mHeaderImage.setScaleType(ImageView.ScaleType.FIT_CENTER);
      mHeaderImage.setImageResource(R.drawable.ic_hash_io_16_monochrome);
    }
    final int statusBarColor=trackColor != 0 ? UIUtils.adjustColorForStatusBar(trackColor) : UIUtils.getThemeColor(this,R.attr.colorPrimaryDark,R.color.theme_primary_dark);
    mDrawerLayout.setStatusBarBackgroundColor(statusBarColor);
  }
}

Fixed version (ground truth):
/** 
 * Set the activity title & header image. <p/> If the user is browsing a single track then it's name is shown as the title and a relevant header image; otherwise a generic title and image is shown.
 */
private void setHeader(){
  if (mMode == MODE_EXPLORE && mTagMetadata != null) {
    String title=null;
    String headerImage=null;
    int trackColor=0;
    int selectedTracks=mTagFilterHolder.getCountByCategory(Config.Tags.CATEGORY_TRACK);
    int selectedThemes=mTagFilterHolder.getCountByCategory(Config.Tags.CATEGORY_THEME);
    if (selectedThemes + selectedTracks == 1) {
      for (      String tagId : mTagFilterHolder.getSelectedFilters()) {
        if (tagId.contains(Config.Tags.CATEGORY_TRACK) || tagId.contains(Config.Tags.CATEGORY_THEME)) {
          TagMetadata.Tag selectedTag=mTagMetadata.getTag(tagId);
          title=selectedTag.getName();
          headerImage=selectedTag.getPhotoUrl();
          trackColor=selectedTag.getColor();
          break;
        }
      }
    }
    if (title == null) {
      title=getString(R.string.title_explore);
    }
    mTitle.setText(title);
    if (headerImage != null) {
      mHeaderImage.setScaleType(ImageView.ScaleType.CENTER_CROP);
      mImageLoader.loadImage(headerImage,mHeaderImage);
    }
 else {
      mHeaderImage.setScaleType(ImageView.ScaleType.FIT_CENTER);
      mHeaderImage.setImageResource(R.drawable.ic_hash_io_16_monochrome);
    }
    final int statusBarColor=trackColor != 0 ? UIUtils.adjustColorForStatusBar(trackColor) : UIUtils.getThemeColor(this,R.attr.colorPrimaryDark,R.color.theme_primary_dark);
    mDrawerLayout.setStatusBarBackgroundColor(statusBarColor);
  }
}