promote_types needed for polyfit()

When I try to use polifit an TypeError occour: 'NoneType' object is not callable

testscript:

import numpy as np
np.polyfit([1,2],[1,2],1)

result with pypy

TypeError                                 Traceback (most recent call last)
<ipython-input-2-812315395059> in <module>()
----> 1 np.polyfit([1,2],[1,2],1)

/home/andreas/python/env/pypy/site-packages/numpy/lib/polynomial.pyc in polyfit(x, y, deg, rcond, full, w, cov)
    561 
    562     # set up least squares equation for powers of x
--> 563     lhs = vander(x, order)
    564     rhs = y
    565 

/home/andreas/python/env/pypy/site-packages/numpy/lib/twodim_base.pyc in vander(x, N, increasing)
    564         N = len(x)
    565 
--> 566     v = empty((len(x), N), dtype=promote_types(x.dtype, int))
    567     tmp = v[:, ::-1] if not increasing else v
    568 

TypeError: 'NoneType' object is not callable

pypy version:

sys.version
'2.7.8 (f5dcc2477b97, Sep 18 2014, 11:33:30)\n[PyPy 2.4.0 with GCC 4.6.3]'

using numpy 1.9.0

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