diff --git a/firmware/controllers/trigger/decoders/trigger_structure.cpp b/firmware/controllers/trigger/decoders/trigger_structure.cpp
index 02bb6ef002..35f7feefe3 100644
--- a/firmware/controllers/trigger/decoders/trigger_structure.cpp
+++ b/firmware/controllers/trigger/decoders/trigger_structure.cpp
@@ -186,6 +186,14 @@ extern bool printTriggerDebug;
 void TriggerWaveform::calculateExpectedEventCounts(bool useOnlyRisingEdgeForTrigger) {
 	UNUSED(useOnlyRisingEdgeForTrigger);
 
+	if (!useOnlyRisingEdgeForTrigger) {
+		for (int i = 0;i<efi::size(expectedEventCount);i++) {
+			if (expectedEventCount[i] % 2 != 0) {
+				firmwareError(ERROR_TRIGGER_DRAMA, "Trigger: should be even %d %d", i, expectedEventCount[i]);
+			}
+		}
+	}
+
 	bool isSingleToothOnPrimaryChannel = useOnlyRisingEdgeForTrigger ? expectedEventCount[0] == 1 : expectedEventCount[0] == 2;
 	// todo: next step would be to set 'isSynchronizationNeeded' automatically based on the logic we have here
 	if (!shapeWithoutTdc && isSingleToothOnPrimaryChannel != !isSynchronizationNeeded) {