Component (@NotNull JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { Component comp = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus); PsiElement[] elements = myRefsResolvedCache.get(getPsiElement()); if (elements == null || elements.length <= index || elements[index] == null) { comp.setForeground(JBColor.RED); } return comp; }