fix: skip invalid candidate.

lib/src/voip/call.dart

@@ -44,6 +44,15 @@ class Timeouts {
   static const delayBeforeOfferMs = 100;
 }
 
+extension RTCIceCandidateExt on RTCIceCandidate {
+  bool get isValid =>
+      sdpMLineIndex != null &&
+      sdpMid != null &&
+      candidate != null &&
+      sdpMid!.isNotEmpty &&
+      candidate!.isNotEmpty;
+}
+
 /// Wrapped MediaStream, used to adapt Widget to display
 class WrappedMediaStream {
   MediaStream? stream;
@@ -716,6 +725,12 @@ class CallSession {
         json['sdpMLineIndex']?.round() ?? 0,
       );
 
+      if (!candidate.isValid) {
+        Logs().w(
+            '[VOIP] onCandidatesReceived => skip invalid candidate $candidate');
+        continue;
+      }
+
       if (direction == CallDirection.kOutgoing &&
           pc != null &&
           await pc!.getRemoteDescription() == null) {