diff --git a/src/ArduinoJson/Variant/ConverterImpl.hpp b/src/ArduinoJson/Variant/ConverterImpl.hpp
index ef79e244..cc3fd1fc 100644
--- a/src/ArduinoJson/Variant/ConverterImpl.hpp
+++ b/src/ArduinoJson/Variant/ConverterImpl.hpp
@@ -199,7 +199,7 @@ struct Converter<decltype(nullptr)> {
   }
   static bool checkJson(VariantConstRef src) {
     const VariantData* data = getData(src);
-    return data == 0 || data->isNull();
+    return data == 0 || data->resolve()->isNull();
   }
 };
 
diff --git a/src/ArduinoJson/Variant/VariantData.hpp b/src/ArduinoJson/Variant/VariantData.hpp
index 7a60249d..a79164f9 100644
--- a/src/ArduinoJson/Variant/VariantData.hpp
+++ b/src/ArduinoJson/Variant/VariantData.hpp
@@ -163,8 +163,6 @@ class VariantData {
   }
 
   bool isNull() const {
-    if (isPointer())  // P+0 G+20
-      return _content.asPointer->isNull();
     return type() == VALUE_IS_NULL;
   }
 
diff --git a/src/ArduinoJson/Variant/VariantFunctions.hpp b/src/ArduinoJson/Variant/VariantFunctions.hpp
index 2bed73dd..e5cb4296 100644
--- a/src/ArduinoJson/Variant/VariantFunctions.hpp
+++ b/src/ArduinoJson/Variant/VariantFunctions.hpp
@@ -103,7 +103,7 @@ NO_INLINE VariantData *variantGetOrAddMember(VariantData *var,
 }
 
 inline bool variantIsNull(const VariantData *var) {
-  return var == 0 || var->isNull();
+  return var == 0 || var->resolve()->isNull();
 }
 
 }  // namespace ARDUINOJSON_NAMESPACE