Whenever I place a jammed data collector or the jammer radar, the game crashes with the errors below. The collector looks like its taking damage before the game crashes and the behavior is the same whether powered or not. The jammer crashes the game immediately upon being powered, but I can place them and leave them unpowered without the game crashing.

Jammed data collector
The mod Castra (0.5.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event castra::on_tick (ID 0)
castra/control.lua:819: attempt to index field 'jammed_data_collectors_jammers' (a nil value)
stack traceback:
castra/control.lua:819: in function 'jammer_updates'
castra/control.lua:836: in function <castra/control.lua:831>

Jammer radar
The mod Castra (0.5.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event castra::on_tick (ID 0)
The mod Castra (0.5.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event castra::script_raised_built (ID 89)
castra/control.lua:541: attempt to index field 'jammed_data_collectors_jammers' (a nil value)
stack traceback:
castra/control.lua:541: in function 'add_jammer_to_data_collector'
castra/control.lua:585: in function 'built_event'
castra/control.lua:620: in function <castra/control.lua:619>
stack traceback:
[C]: in function 'create_entity'
castra/control.lua:806: in function 'jammer_updates'
castra/control.lua:836: in function <castra/control.lua:831>