Not sure if the mod is still being supported, but I found a crash. When you try to manually place a gate too close to another one, it won't let you. But you can shift-click to place a ghost right next to another gate. When a construction robot builds the gate I have the following crash message:

The mod Stargate (0.1.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event stargate::on_robot_built_entity (ID 14)
stargate/control.lua:60: attempt to index global 'f' (a nil value)
stack traceback:
stargate/control.lua:60: in function 'OnStargateBuilt'
stargate/control.lua:133: in function '?'
stargate/lib/lib_control_cache.lua:152: in function 'call_ents'
stargate/lib/lib_control_cache.lua:394: in function 'y'
stargate/lib/lib_control.lua:286: in function <stargate/lib/lib_control.lua:286>