diff --git a/src/Serializer/JsonEncoder.php b/src/Serializer/JsonEncoder.php
index 2a95e510bb0..53fa2f8aa1f 100644
--- a/src/Serializer/JsonEncoder.php
+++ b/src/Serializer/JsonEncoder.php
@@ -40,7 +40,7 @@ public function __construct(string $format, BaseJsonEncoder $jsonEncoder = null)
         }
 
         // Encode <, >, ', &, and " characters in the JSON, making it also safe to be embedded into HTML.
-        $jsonEncodeOptions = \JSON_HEX_TAG | \JSON_HEX_APOS | \JSON_HEX_AMP | \JSON_HEX_QUOT | \JSON_UNESCAPED_UNICODE;
+        $jsonEncodeOptions = \JSON_HEX_TAG | \JSON_HEX_APOS | \JSON_HEX_AMP | \JSON_HEX_QUOT | \JSON_UNESCAPED_UNICODE | (\PHP_VERSION_ID >= 70200 ? \JSON_INVALID_UTF8_IGNORE : 0);
         if (interface_exists(AdvancedNameConverterInterface::class)) {
             $jsonEncode = new JsonEncode(['json_encode_options' => $jsonEncodeOptions]);
             $jsonDecode = new JsonDecode(['json_decode_associative' => true]);
diff --git a/tests/Serializer/JsonEncoderTest.php b/tests/Serializer/JsonEncoderTest.php
index a4138b3fffd..2be8c917f96 100644
--- a/tests/Serializer/JsonEncoderTest.php
+++ b/tests/Serializer/JsonEncoderTest.php
@@ -54,4 +54,20 @@ public function testDecode()
     {
         $this->assertEquals(['foo' => 'bar'], $this->encoder->decode('{"foo":"bar"}', 'json'));
     }
+
+    public function testUTF8EncodedString()
+    {
+        $data = ['foo' => 'Über'];
+
+        $this->assertEquals('{"foo":"Über"}', $this->encoder->encode($data, 'json'));
+    }
+
+    public function testUTF8MalformedHandlingEncoding()
+    {
+        if (\PHP_VERSION_ID >= 70200) {
+            $data = ['foo' => pack('H*', 'B11111')];
+
+            $this->assertEquals('{"foo":"\u0011\u0011"}', $this->encoder->encode($data, 'json'));
+        }
+    }
 }