diff --git a/lib/src/voip/call.dart b/lib/src/voip/call.dart
index 8ed6c19a..713fc1a1 100644
--- a/lib/src/voip/call.dart
+++ b/lib/src/voip/call.dart
@@ -940,10 +940,20 @@ class CallSession {
         ..transferee = false;
 
       final metadata = SDPStreamMetadata({
-        localUserMediaStream!.stream!.id: SDPStreamPurpose(
-            purpose: SDPStreamMetadataPurpose.Usermedia,
-            audio_muted: localUserMediaStream!.stream!.getAudioTracks().isEmpty,
-            video_muted: localUserMediaStream!.stream!.getVideoTracks().isEmpty)
+        if (localUserMediaStream != null)
+          localUserMediaStream!.stream!.id: SDPStreamPurpose(
+              purpose: SDPStreamMetadataPurpose.Usermedia,
+              audio_muted:
+                  localUserMediaStream!.stream!.getAudioTracks().isEmpty,
+              video_muted:
+                  localUserMediaStream!.stream!.getVideoTracks().isEmpty),
+        if (localScreenSharingStream != null)
+          localScreenSharingStream!.stream!.id: SDPStreamPurpose(
+              purpose: SDPStreamMetadataPurpose.Screenshare,
+              audio_muted:
+                  localScreenSharingStream!.stream!.getAudioTracks().isEmpty,
+              video_muted:
+                  localScreenSharingStream!.stream!.getVideoTracks().isEmpty),
       });
 
       await pc!.setLocalDescription(answer);