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### Unhandled SIGABRT when working with polynomial rings

Hello, experts!

I am working with multivariate polynomial rings in a finite field, such as

K.<a1,b1,a2,b2,x>=PolynomialRing(GF(32003))


But when I try to define an object like this one:

c1=numerator((a1+b1*I)+(a1-b1*I)*x^(-5))


I get a SIGABRT from Sage and the program terminates giving an Ubuntu error (something like "gdb stopped working").

This pastebin shows the output: http://pastebin.com/jKEM87aS. Even though it says Saved trace to /home/slenderman/.sage/crash_logs/crash_oImBtz.log, that file is totally empty.

More information: if I use the ring over Q it works perfectly

K.<a1,b1,a2,b2,x>=QQ[]


Also, I have Sage version 7.2 compiled from the git repository.

Thank you in advanced for any help!