diff --git a/src/lib/conversion/control.ts b/src/lib/conversion/control.ts
index 241a304..8435c23 100644
--- a/src/lib/conversion/control.ts
+++ b/src/lib/conversion/control.ts
@@ -113,11 +113,11 @@ export class ConversionControl {
 		const event = new ServerEvent()
 			.setEventName(eventName)
 			.setEventTime(Math.floor(Date.now() / 1000))
-			.setEventId(details.eventID)
 			.setUserData(buildUserData(details.userData))
 			.setActionSource(details.actionSource);
 
-		if (details?.eventSourceURL) event.setEventSourceUrl(details.eventSourceURL);
+		if (details.eventID) event.setEventId(details.eventID);
+		if (details.eventSourceURL) event.setEventSourceUrl(details.eventSourceURL);
 		if (params) {
 			const customData = buildCustomData(params);
 			event.setCustomData(customData);
diff --git a/src/lib/types/conversion.d.ts b/src/lib/types/conversion.d.ts
index bb731f3..775b310 100644
--- a/src/lib/types/conversion.d.ts
+++ b/src/lib/types/conversion.d.ts
@@ -51,7 +51,7 @@ export type ConversionEventParams = {
  * Parameters for sending a conversion event to Meta Pixel.
  */
 export type ConversionEventDetails = {
-	eventID: string;
+	eventID?: string;
 	actionSource: 'website' | 'app' | 'offline' | 'other';
 	userData: ConversionUserData;
 	eventSourceURL?: string;