diff --git a/android/src/main/java/com/pauldemarco/flutter_blue/FlutterBluePlugin.java b/android/src/main/java/com/pauldemarco/flutter_blue/FlutterBluePlugin.java
index f3ffbdb9..30f66b22 100644
--- a/android/src/main/java/com/pauldemarco/flutter_blue/FlutterBluePlugin.java
+++ b/android/src/main/java/com/pauldemarco/flutter_blue/FlutterBluePlugin.java
@@ -999,7 +999,9 @@ private void invokeMethodUIThread(final String name, final byte[] byteArray)
                 new Runnable() {
                     @Override
                     public void run() {
-                        channel.invokeMethod(name, byteArray);
+                        if(channel != null) {
+                            channel.invokeMethod(name, byteArray);
+                        }
                     }
                 });
     }
diff --git a/pubspec.yaml b/pubspec.yaml
index 220c089d..91f9184d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -13,7 +13,7 @@ dependencies:
   flutter:
     sdk: flutter
   convert: ^3.0.0
-  protobuf: ^2.0.0
+  protobuf: ^2.1.0
   rxdart: ^0.26.0
   collection: ^1.15.0
   meta: ^1.3.0