gather: no solution found

In an SNFS factorization of 13243^29-1, using current Git version (2f62ccc8), I encountered this error:

Saving K.sols0-64.0 ... done [1.00 MB in 0.00s, 1.30 GB/s]
V * M^1 is NOT zero [K.sols0-64.0 contains V * M^0]!
Hamming weight is 131071
Saving K.sols0-64.1 ... done [1.00 MB in 0.00s, 1.88 GB/s]
V * M^2 is NOT zero [K.sols0-64.1 contains V * M^1]!
Hamming weight is 131071
Saving K.sols0-64.2 ... done [1.00 MB in 0.00s, 1.82 GB/s]
V * M^3 is NOT zero [K.sols0-64.2 contains V * M^2]!
Hamming weight is 131071
Saving K.sols0-64.3 ... done [1.00 MB in 0.00s, 1.64 GB/s]
V * M^4 is NOT zero [K.sols0-64.3 contains V * M^3]!
Hamming weight is 131071
Saving K.sols0-64.4 ... done [1.00 MB in 0.00s, 1.85 GB/s]
V * M^5 is NOT zero [K.sols0-64.4 contains V * M^4]!
Hamming weight is 131071
Saving K.sols0-64.5 ... done [1.00 MB in 0.00s, 1.84 GB/s]
V * M^6 is NOT zero [K.sols0-64.5 contains V * M^5]!
Hamming weight is 131071
Saving K.sols0-64.6 ... done [1.00 MB in 0.00s, 1.83 GB/s]
V * M^7 is NOT zero [K.sols0-64.6 contains V * M^6]!
Hamming weight is 131071
Saving K.sols0-64.7 ... done [1.00 MB in 0.00s, 1.84 GB/s]
V * M^8 is NOT zero [K.sols0-64.7 contains V * M^7]!
Hamming weight is 131071
Saving K.sols0-64.8 ... done [1.00 MB in 0.00s, 1.83 GB/s]
V * M^9 is NOT zero [K.sols0-64.8 contains V * M^8]!
Hamming weight is 131071
Solution range 0..64: no solution found [131071 non zero coefficients in result], most probably a bug
Timings for gather: (wct) 0.13
Timings for gather: (cpu) 0.21 (aggregated over all threads and 1 MPI jobs)

If this kind of bug is not known already, I can upload the full working directory (584MB) somewhere - plafrim, or a public file hoster, or a machine of your choice. Edit: fixed messed-up code block