diff --git a/astLib/__init__.py b/astLib/__init__.py
index a7adda3..5cbf861 100644
--- a/astLib/__init__.py
+++ b/astLib/__init__.py
@@ -13,4 +13,4 @@
 """
 
 __all__=['astCalc', 'astCoords', 'astImages', 'astPlots', 'astStats', 'astWCS', 'astSED']
-__version__ = '0.13.0'
+__version__ = '0.13.1'
diff --git a/astLib/astCoords.py b/astLib/astCoords.py
index 29891f5..f95383f 100755
--- a/astLib/astCoords.py
+++ b/astLib/astCoords.py
@@ -264,7 +264,7 @@ def calcAngSepDeg(RADeg1, decDeg1, RADeg2, decDeg2):
     r=numpy.degrees(numpy.arccos(a))
             
     # Above gives nan when RADeg1, decDeg1 == RADeg1, decDeg2
-    indexList=numpy.where(numpy.isnan(r) == True)[0]
+    indexList=numpy.where(numpy.isnan(numpy.atleast_1d(r)) == True)[0]
     tolerance=1e-6
     if len(indexList) > 0:
         for index in indexList:
diff --git a/setup.py b/setup.py
index 3421e13..e85cfe8 100644
--- a/setup.py
+++ b/setup.py
@@ -58,7 +58,7 @@ def build_extensions(self):
         build_ext.build_extensions(self)
 
 setup(name='astLib',
-    version='0.13.0',
+    version='0.13.1',
     packages=['astLib', 'PyWCSTools'],
     package_data={'astLib': ['data/*']},
     cmdclass={"build_ext": build_PyWCSTools_ext},