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-rw-r--r--lib/stwcs/distortion/coeff_converter.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/stwcs/distortion/coeff_converter.py b/lib/stwcs/distortion/coeff_converter.py
index a0ff1a4..301ee48 100644
--- a/lib/stwcs/distortion/coeff_converter.py
+++ b/lib/stwcs/distortion/coeff_converter.py
@@ -51,7 +51,7 @@ def sip2idc(wcs):
if None in [ocx10, ocx11, ocy10, ocy11]:
print 'First order IDC coefficients not found, exiting ...\n'
- return
+ return None, None
idc_coeff = np.array([[ocx11, ocx10], [ocy11, ocy10]])
cx = np.zeros((order+1,order+1), dtype=np.double)
cy = np.zeros((order+1,order+1), dtype=np.double)