Fwd: error in cur.mogrify line

To do so I'm using the attached 'insert.py' script.

As you see I'm reading the FITS table with ATpy 0.9.7 module.

From there I convert the columns of tbl2 I want to insert into a numpy.array (L36), I connect to the database (password is fake but doesn't matter for the purpose of my question :), and then I get the error in around cur.mogrify in L54:

Traceback (most recent call last):
  File "insert.py", line 54, in <module>
    args_str = ','.join(cur.mogrify("(%s,%s,%s,%s,%s,%s,%s,%s)", x) for x in targets)
  File "insert.py", line 54, in <genexpr>
    args_str = ','.join(cur.mogrify("(%s,%s,%s,%s,%s,%s,%s,%s)", x) for x in targets)
TypeError: not all arguments converted during string formatting

The 'referencecat' table definition is the following:

CREATE TABLE referencecat
(
  ref_id bigserial NOT NULL, -- SEXtractor running reference object number.
  ref_alphawin_j2000 double precision, -- Windowed right ascension (J2000).
  ref_deltawin_j2000 double precision, -- Windowed declination (J2000).
  ref_object character varying(18), -- Source identificator from (RA,DEC): JHHMMSSSS+DDMMSSSS
  ref_snr real, -- SNR (flux_auto / fluxerr_auto)
  ref_elongation real, -- A_IMAGE/B_IMAGE
  ref_fwhm_image real, -- FWHM assuming a gaussian core.
  ref_flags character varying(3), -- Extraction flags.
  CONSTRAINT pk_ref_id PRIMARY KEY (ref_id)
)
WITH (
  OIDS=FALSE
);

I've been struggling and googling searching for a solution but unsuccessfully :(