ExprResolveLhs(struct xkb_context *ctx, const ExprDef *expr,
               const char **elem_rtrn, const char **field_rtrn,
               ExprDef **index_rtrn)
{
    switch (expr->expr.op) {
    case EXPR_IDENT:
        *elem_rtrn = NULL;
        *field_rtrn = xkb_atom_text(ctx, expr->ident.ident);
        *index_rtrn = NULL;
        return (*field_rtrn != NULL);
    case EXPR_FIELD_REF:
        *elem_rtrn = xkb_atom_text(ctx, expr->field_ref.element);
        *field_rtrn = xkb_atom_text(ctx, expr->field_ref.field);
        *index_rtrn = NULL;
        return (*elem_rtrn != NULL && *field_rtrn != NULL);
    case EXPR_ARRAY_REF:
        *elem_rtrn = xkb_atom_text(ctx, expr->array_ref.element);
        *field_rtrn = xkb_atom_text(ctx, expr->array_ref.field);
        *index_rtrn = expr->array_ref.entry;
	if (expr->array_ref.element != XKB_ATOM_NONE && *elem_rtrn == NULL)
		return false;
	if (*field_rtrn == NULL)
		return false;
        return true;
    default:
        break;
    }
    log_wsgo(ctx, "Unexpected operator %d in ResolveLhs\n", expr->expr.op);
    return false;
}
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.