Crash after Alloc an err=5

[FFAMax]

Hello, Team.

Not the first time I see the crash like:

DEBUG | ??:??:?? 720 [Router] Reliable send failed, returning a nak for fr=0x8dd0d641,to=0xa6186dc4,id=0x6b046282
DEBUG | ??:??:?? 720 [Router] Partially randomized packet id 246769283
WARN  | ??:??:?? 720 [Router] Alloc an err=5,to=0x8dd0d641,idFrom=0x6b046282,id=0xeb56683
DEBUG | ??:??:?? 720 [Router] Enqueued local 
0x0eb56683:0x8dd0d641->0x8dd0d641 tr: 0 WantAck=0 HL=0 HS=0 Ch=0x0 Portnum:5 reqId:6b046282 Pr:��@INFO  | ??:??:?? 0 

//\ E S H T /\ S T / C

Probably some other calls were not logged.
Any ideas?