diff --git a/ios/Classes/FlutterSegmentPlugin.m b/ios/Classes/FlutterSegmentPlugin.m
index 2c7b1245..60eebf98 100644
--- a/ios/Classes/FlutterSegmentPlugin.m
+++ b/ios/Classes/FlutterSegmentPlugin.m
@@ -187,6 +187,8 @@ - (void)identify:(FlutterMethodCall*)call result:(FlutterResult)result {
     NSDictionary *traits = call.arguments[@"traits"];
     NSDictionary *options = call.arguments[@"options"];
 
+    userId = [userId isEqual:[NSNull null]]? nil: userId;
+
     [[SEGAnalytics sharedAnalytics] identify: userId
                       traits: traits
                      options: options];