Slip rate increases to infinity in the calculation

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Dear Ms Li,
I'm having trouble running the branch SEAS_BP7_QD_A. In the calculation, the slip rate on fault keep increasing and finally become infinity. Here are some of the output in file maxvall-BP7.dat,

0.499057199999943E+00 0.1787373E+01 0.3641661E+15 0.5391787E+15
0.499088735999943E+00 0.1855251E+01 0.4060318E+15 0.6137003E+15
0.499120271999943E+00 0.1858721E+01 NaN NaN
0.499151807999943E+00 -Infinity NaN NaN
0.499183343999944E+00 -Infinity NaN NaN

The green function was calculated by the program in file TriGreen, I've checked it and should be correct. In fact, I met the same problem when running the BP5. Do you have any idea what the problem might be?