panic: division of zero by zero or infinity by infinity error when running GODON positive selection analysis

I am using godon to find genes under positive selection with the branch-site test. However, after running for a little while I get the error "panic: division of zero by zero or infinity by infinity".

Below is the full output with the error report. I can supply the phylogenetic tree and fasta file I am using if that would be helpful. Thank you.

iter=33 lnL=-73104.072
iter=66 lnL=-72956.855
iter=99 lnL=-72912.956
iter=131 lnL=-72902.900
iter=162 lnL=-72900.147
iter=194 lnL=-72898.562
iter=226 lnL=-72897.970
iter=258 lnL=-72897.651
iter=289 lnL=-72897.435
iter=321 lnL=-72897.284
iter=353 lnL=-72897.199
iter=385 lnL=-72897.153
iter=416 lnL=-72897.108
iter=448 lnL=-72897.076
iter=17 lnL=-72890.551
panic: division of zero by zero or infinity by infinity
goroutine 1 [running]:
math/big.(*Float).Quo(0xc4273a8f40, 0xc4273a8f68, 0xc4273a8f18, 0xc42e88c118)
/usr/local/go/src/math/big/float.go:1639 +0x15c
bitbucket.org/Davydov/godon/cmodel.(*BranchSite).BEBPosterior(0xc422164120, 0xc4259bb900, 0x91, 0x91)
/go/src/bitbucket.org/Davydov/godon/cmodel/bs.go:416 +0x6e9
bitbucket.org/Davydov/godon/cmodel.(*BranchSite).Final(0xc422164120, 0x101)
/go/src/bitbucket.org/Davydov/godon/cmodel/bs.go:455 +0x112
main.computeFinal(0x1f263a0, 0xc422164120, 0xc4201522a0, 0x101, 0x6a80, 0x0)
/go/src/bitbucket.org/Davydov/godon/godon/optimize.go:150 +0x93
main.performSingleTest(0xc420162320, 0xc428266000, 0x9399, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, …)
/go/src/bitbucket.org/Davydov/godon/godon/hyptest.go:335 +0x1b52
main.hypTest(0x1ee03a7, 0x1ee03a7, 0x4, 0xc4201aa501, 0x1, 0x1)
/go/src/bitbucket.org/Davydov/godon/godon/hyptest.go:88 +0x71a
main.main()
/go/src/bitbucket.org/Davydov/godon/godon/godon.go:316 +0xefa