diff --git a/src/Branches.cpp b/src/Branches.cpp
index 60d3d78..d8ac48f 100644
--- a/src/Branches.cpp
+++ b/src/Branches.cpp
@@ -69,7 +69,11 @@ static void computeChannel(const float *in, const float *p, float threshold, flo
 
 void Branches::step() {
 	computeChannel(inputs[IN1_INPUT], inputs[P1_INPUT], params[THRESHOLD1_PARAM], params[MODE1_PARAM], &lastGate[0], &outcome[0], outputs[OUT1A_OUTPUT], outputs[OUT1B_OUTPUT], &light[0]);
-	computeChannel(inputs[IN2_INPUT], inputs[P2_INPUT], params[THRESHOLD2_PARAM], params[MODE2_PARAM], &lastGate[1], &outcome[1], outputs[OUT2A_OUTPUT], outputs[OUT2B_OUTPUT], &light[1]);
+
+	if(inputs[IN2_INPUT])
+		computeChannel(inputs[IN2_INPUT], inputs[P2_INPUT], params[THRESHOLD2_PARAM], params[MODE2_PARAM], &lastGate[1], &outcome[1], outputs[OUT2A_OUTPUT], outputs[OUT2B_OUTPUT], &light[1]);
+	else
+		computeChannel(inputs[IN1_INPUT], inputs[P2_INPUT], params[THRESHOLD2_PARAM], params[MODE2_PARAM], &lastGate[1], &outcome[1], outputs[OUT2A_OUTPUT], outputs[OUT2B_OUTPUT], &light[1]);
 }