diff --git a/lib/src/base/contactor/models/exception.dart b/lib/src/base/contactor/models/exception.dart
index 7148772..854a467 100644
--- a/lib/src/base/contactor/models/exception.dart
+++ b/lib/src/base/contactor/models/exception.dart
@@ -37,6 +37,6 @@ class IsolateException implements Exception {
 
   /// Check if the [map] is a valid [IsolateException].
   static bool isValidMap(Map<dynamic, dynamic> map) {
-    return map.containsKey('type') && map['type'] == r'$IsolateException';
+    return map['type'] == r'$IsolateException';
   }
 }
diff --git a/lib/src/base/contactor/models/isolate_state.dart b/lib/src/base/contactor/models/isolate_state.dart
index e7854f2..39f0b78 100644
--- a/lib/src/base/contactor/models/isolate_state.dart
+++ b/lib/src/base/contactor/models/isolate_state.dart
@@ -15,8 +15,6 @@ enum IsolateState {
 
   /// Check if the [map] is a valid enum.
   bool isValidMap(Map<dynamic, dynamic> map) {
-    return map.containsKey('type') &&
-        map['type'] == r'$IsolateState' &&
-        map['value'] == name;
+    return map['type'] == r'$IsolateState' && map['value'] == name;
   }
 }