CryptoMiniSat assertion error

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I'm trying to use sage.sat.boolean_polynomials to solve a system of equations for my thesis. I'm ok with the fact it uses CryptoMiniSat as default but every time I run my script I get this error:

 Traceback (most recent call last):
  File "simon_equations.py", line 104, in <module>
    s = alg_attack(p,c)
  File "simon_equations.py", line 55, in alg_attack
    return solve_sat(F)
  File "/home/frollo/sage-6.7/local/lib/python2.7/site-packages/sage/sat/boolean_polynomials.py", line 179, in solve
    phi = converter(F)
  File "/home/frollo/sage-6.7/local/lib/python2.7/site-packages/sage/sat/converters/polybori.py", line 581, in __call__
    self.clauses(f)
  File "/home/frollo/sage-6.7/local/lib/python2.7/site-packages/sage/sat/converters/polybori.py", line 538, in clauses
    self.clauses_sparse(f)
  File "/home/frollo/sage-6.7/local/lib/python2.7/site-packages/sage/sat/converters/polybori.py", line 296, in clauses_sparse
    self.solver.add_clause(clause(c))
  File "sage/sat/solvers/cryptominisat/cryptominisat.pyx", line 205, in sage.sat.solvers.cryptominisat.cryptominisat.CryptoMiniSat.add_clause (build/cythonized/sage/sat/solvers/cryptominisat/cryptominisat.cpp:1672)
AssertionError

I got to line 205 of sage/sat/solvers/cryptominisat/cryptominisat.pyx and found this:

assert(self._solver.okay())

I found nothing about this in the documentation, so I decided to try some bad practices and commented away the assertion, restarted sage and tried again. I got the same error, referring to a line that is now a comment. I tried to restart my shell but, again, I got the same error.

Has anyone a clue about which could be causing this (the same script worked during the tests, the error just started showing up when I tried to run something serious)