diff --git a/lib/models/call_stats.dart b/lib/models/call_stats.dart
index 267815f..6eab4a9 100644
--- a/lib/models/call_stats.dart
+++ b/lib/models/call_stats.dart
@@ -174,7 +174,7 @@ class CallStats {
     json["fecDownloadBandwidth"],
     json["fecRepairedPacketsNumber"],
     json["fecUploadBandwidth"],
-    json["iceState"],
+    json["iceState"].toString(),
     json["jitterBufferSizeMs"],
     json["latePacketsCumulativeNumber"],
     json["localLateRate"],
@@ -193,15 +193,15 @@ class CallStats {
     json["rtpSent"],
     json["senderInterarrivalJitter"],
     json["senderLossRate"],
-    json["srtpSource"],
-    json["srtpSuite"],
+    json["srtpSource"].toString(),
+    json["srtpSuite"].toString(),
     json["uploadBandwidth"],
-    json["upnpState"],
-    json["zrtpAuthTagAlgo"],
-    json["zrtpCipherAlgo"],
-    json["zrtpHashAlgo"],
-    json["zrtpKeyAgreementAlgo"],
-    json["zrtpSasAlgo"],
+    json["upnpState"].toString(),
+    json["zrtpAuthTagAlgo"].toString(),
+    json["zrtpCipherAlgo"].toString(),
+    json["zrtpHashAlgo"].toString(),
+    json["zrtpKeyAgreementAlgo"].toString(),
+    json["zrtpSasAlgo"].toString(),
     json["isZrtpKeyAgreementAlgoPostQuantum"],
   );