diff --git a/sim/group.lua b/sim/group.lua
index 0d37e80..8efe588 100644
--- a/sim/group.lua
+++ b/sim/group.lua
@@ -216,8 +216,8 @@ function Group.update_net_c(netc, tick)
 		netc.state[0] = state
 		netc.update_tick[0] = tick
 		
-		local len = netc.num_gates_update[0]
-		for i = 1, len do
+		local len = netc.num_gates_update[0]-1
+		for i = 0, len do
 			local gatec = netc.gates_update_c[i]
 			if gatec and gatec.in_queue[0]==0 then
 				Simulation.queue_gate_c(GSim, gatec)