Factorio Version 1.1.61
Bob mods added, and different others

crash log :

57011.737 Error MainLoop.cpp:1284: Exception at tick 197762990: The mod Belt Balancer (3.0.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event belt-balancer::on_robot_mined_entity (ID 66)
belt-balancer/objects/part.lua:197: attempt to index local 'part' (a nil value)
stack traceback:
belt-balancer/objects/part.lua:197: in function 'remove'
belt-balancer/control.lua:165: in function <belt-balancer/control.lua:154>
57048.017 Info HttpSharedState.cpp:54: Downloading https://mods.factorio.com/api/mods?page_size=max&full=True&version=1.1.61&lang=en

different situation same error

590.516 Error MainLoop.cpp:1284: Exception at tick 197766735: The mod Belt Balancer (3.0.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event belt-balancer::on_nth_tick(2)
LuaTransportLine API call when LuaTransportLine was invalid.
stack traceback:
[C]: in function 'len'
__belt-balancer/objects/balancer.lua:198: in function 'run'
belt-balancer/helper/message-handler.lua:33: in function <belt-balancer/helper/message-handler.lua:31>

Was removing chests with balancer from my map

if needed, ask for my save and my modlist

I downloaded mod called "water fill" and placed water under that broken object, it worked for me removing it.