undump: panic (sql no rows)

[whilei]

tile 18/144232/77102 size is 1487461 with detail 14, >1000000
Going to try keeping the sparsest 60.51% of the features to make it fit
  99.9%  18/144232/77102
Dump: Migrating .mbtiles file back into a bolt db:  tippedcanoetrack.db
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x553650]

goroutine 1 [running]:
sync.(*RWMutex).RLocker(...)
        /usr/local/go/src/database/sql/sql.go:2441
database/sql.(*Rows).Next(0x0, 0xc420458060)
        /usr/local/go/src/database/sql/sql.go:2441 +0x30
github.com/rotblauer/tileTester2/undump.checkCount(0x0, 0x6e7da0)
        /root/gocode/src/github.com/rotblauer/tileTester2/undump/undump.go:92 +0x49
github.com/rotblauer/tileTester2/undump.MbtilesToBolt(0xc420458010, 0xb, 0x6e34ed, 0x13)
        /root/gocode/src/github.com/rotblauer/tileTester2/undump/undump.go:115 +0xe4
main.main()
        /root/gocode/src/github.com/rotblauer/tileTester2/dump.go:243 +0x610