"polyxpoly" doesn't work for some particular set of data

I have a problem with "polyxpoly" which can't find the intersection point of below data set, one set of AA and BB is same value (AA(3,2) = BB(3,2). AA are (X and Y)

   0.007507246205337   0.837497370043180
   0.007432053248162   0.843747542963220
   0.007356860290987   0.849997715883261
   0.007285124879676   0.856247869316323
   0.007213389468364   0.862498022749385

BB are (X and Y)

   0.010289928363969   0.849996856934689
   0.008825471754196   0.849997274793503
   0.007356860290987   0.849997715883261
   0.005888248827779   0.849998156973018
   0.004416875790819   0.849998613770215

[xx,yy] = polyxpoly(AA(:,1),AA(:,2),BB(:,1),BB(:,2))

xx =

   Empty matrix: 0-by-1

yy =

   Empty matrix: 0-by-1

But when I scale BB(:,2) by .9999999999999999, it works fine. [xx,yy] = polyxpoly(AA(:,1),AA(:,2),BB(:,1),BB(:,2)*.9999999999999999) xx =

   0.007356860290987

yy =

   0.849997715883260

Any bug? or this function can't find the intersection point of data set that has the same value?

Thank you very much SAM