Tor Software Error
circuit_package_relay_cell(): Bug: outgoing relay cell sent from ../src/or/relay.c:737 has n_chan==NULL. Dropping. (on Tor 0.3.0.10 c33db290)
The consensus seems to be that this is a duplicate of legacy/trac#8185 (moved). If so, then it's still there. Nothing unusual logged before, nor after, so I've got nothing helpful to add, beyond "someone seems to have wanted to know".