diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2148c6d7..13937981 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 ArduinoJson: change log
 =======================
 
+HEAD
+----
+
+* Fix support for NUL characters in `deserializeJson()`
+
 v7.2.1 (2024-11-15)
 ------
 
diff --git a/extras/tests/JsonDeserializer/filter.cpp b/extras/tests/JsonDeserializer/filter.cpp
index 4dc2fc6d..894df750 100644
--- a/extras/tests/JsonDeserializer/filter.cpp
+++ b/extras/tests/JsonDeserializer/filter.cpp
@@ -693,6 +693,15 @@ TEST_CASE("Filtering") {
           "null",
           0,
       },
+      {
+          "NUL character in key",
+          "{\"x\":0,\"x\\u0000a\":1,\"x\\u0000b\":2}",
+          "{\"x\\u0000a\":true}",
+          10,
+          DeserializationError::Ok,
+          "{\"x\\u0000a\":1}",
+          sizeofObject(1) + sizeofString("x?a"),
+      },
   };
 
   for (auto& tc : testCases) {
diff --git a/extras/tests/JsonDeserializer/object.cpp b/extras/tests/JsonDeserializer/object.cpp
index ee62ae43..9f0aecb4 100644
--- a/extras/tests/JsonDeserializer/object.cpp
+++ b/extras/tests/JsonDeserializer/object.cpp
@@ -6,6 +6,7 @@
 #include <catch.hpp>
 
 #include "Allocators.hpp"
+#include "Literals.hpp"
 
 using ArduinoJson::detail::sizeofObject;
 
@@ -322,10 +323,11 @@ TEST_CASE("deserialize JSON object") {
 
     SECTION("NUL in keys") {
       DeserializationError err =
-          deserializeJson(doc, "{\"x\\u0000a\":1,\"x\\u0000b\":2}");
+          deserializeJson(doc, "{\"x\":0,\"x\\u0000a\":1,\"x\\u0000b\":2}");
 
       REQUIRE(err == DeserializationError::Ok);
-      REQUIRE(doc.as<std::string>() == "{\"x\\u0000a\":1,\"x\\u0000b\":2}");
+      REQUIRE(doc.as<std::string>() ==
+              "{\"x\":0,\"x\\u0000a\":1,\"x\\u0000b\":2}");
     }
   }
 
diff --git a/src/ArduinoJson/Json/JsonDeserializer.hpp b/src/ArduinoJson/Json/JsonDeserializer.hpp
index 459f78af..a4d6c5a6 100644
--- a/src/ArduinoJson/Json/JsonDeserializer.hpp
+++ b/src/ArduinoJson/Json/JsonDeserializer.hpp
@@ -270,10 +270,10 @@ class JsonDeserializer {
 
       JsonString key = stringBuilder_.str();
 
-      TFilter memberFilter = filter[key.c_str()];
+      TFilter memberFilter = filter[key];
 
       if (memberFilter.allow()) {
-        auto member = object.getMember(adaptString(key.c_str()), resources_);
+        auto member = object.getMember(adaptString(key), resources_);
         if (!member) {
           // Save key in memory pool.
           auto savedKey = stringBuilder_.save();