exception in twavedelineatorphysionet example

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The twavedelineatorphysionet example crashes on PhysioNet record ecgrdvq/medians/1003/51e825ab-8676-4e56-93ed-a69789e7ee50:

$ ./examples/twavedelineatorphysionet \
      --record ecgrdvq/medians/1003/51e825ab-8676-4e56-93ed-a69789e7ee50 \
      --rr 898 \
      --qon 305 \
      --qoff 396 \
      --rpeak 347

error: Row::subvec(): indices out of bounds or incorrectly used

Exception caught in t-wave Delineator: Row::subvec(): indices out of bounds or incorrectly used

(I have not encountered this problem with any other records in ecgrdvq/medians/.)