@ -175,7 +175,7 @@ class errorbar(object):
def __str__(self):
if getattr(self, "eb", None):
return self.eb
elif getattr(self, "eb", None) == None and getattr(self, "ebproc", None) != None:
elif getattr(self, "eb", None) == None and callable(getattr(self, "ebproc", None)):
self.eb = self.ebproc(self.val, self.err)
else: