diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php
index 6b05612ff53d..2e00fc226231 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php
@@ -185,6 +185,12 @@ protected function describeContainerParameter($parameter, array $options = [])
     private function writeData(array $data, array $options)
     {
         $flags = isset($options['json_encoding']) ? $options['json_encoding'] : 0;
+
+        if (\PHP_VERSION_ID >= 70300 && (JSON_THROW_ON_ERROR & $flags)) {
+            // Work around https://bugs.php.net/77997
+            json_encode(null);
+        }
+
         $this->write(json_encode($data, $flags | JSON_PRETTY_PRINT)."\n");
     }
 
diff --git a/src/Symfony/Component/Console/Descriptor/JsonDescriptor.php b/src/Symfony/Component/Console/Descriptor/JsonDescriptor.php
index 197b843d4b76..529fb82c4029 100644
--- a/src/Symfony/Component/Console/Descriptor/JsonDescriptor.php
+++ b/src/Symfony/Component/Console/Descriptor/JsonDescriptor.php
@@ -97,7 +97,14 @@ protected function describeApplication(Application $application, array $options
      */
     private function writeData(array $data, array $options)
     {
-        $this->write(json_encode($data, isset($options['json_encoding']) ? $options['json_encoding'] : 0));
+        $flags = isset($options['json_encoding']) ? $options['json_encoding'] : 0;
+
+        if (\PHP_VERSION_ID >= 70300 && (JSON_THROW_ON_ERROR & $flags)) {
+            // Work around https://bugs.php.net/77997
+            json_encode(null);
+        }
+
+        $this->write(json_encode($data, $flags));
     }
 
     /**
diff --git a/src/Symfony/Component/Form/Console/Descriptor/JsonDescriptor.php b/src/Symfony/Component/Form/Console/Descriptor/JsonDescriptor.php
index ab518dbfeed1..00a5425866b2 100644
--- a/src/Symfony/Component/Form/Console/Descriptor/JsonDescriptor.php
+++ b/src/Symfony/Component/Form/Console/Descriptor/JsonDescriptor.php
@@ -82,6 +82,12 @@ protected function describeOption(OptionsResolver $optionsResolver, array $optio
     private function writeData(array $data, array $options)
     {
         $flags = isset($options['json_encoding']) ? $options['json_encoding'] : 0;
+
+        if (\PHP_VERSION_ID >= 70300 && (JSON_THROW_ON_ERROR & $flags)) {
+            // Work around https://bugs.php.net/77997
+            json_encode(null);
+        }
+
         $this->output->write(json_encode($data, $flags | JSON_PRETTY_PRINT)."\n");
     }
 
diff --git a/src/Symfony/Component/HttpFoundation/JsonResponse.php b/src/Symfony/Component/HttpFoundation/JsonResponse.php
index 6fb32ee41bda..52f55f7486c9 100644
--- a/src/Symfony/Component/HttpFoundation/JsonResponse.php
+++ b/src/Symfony/Component/HttpFoundation/JsonResponse.php
@@ -153,6 +153,11 @@ public function setData($data = [])
                     restore_error_handler();
                 }
             } else {
+                if (\PHP_VERSION_ID >= 70300 && (JSON_THROW_ON_ERROR & $this->encodingOptions)) {
+                    // Work around https://bugs.php.net/77997
+                    json_encode(null);
+                }
+
                 try {
                     $data = json_encode($data, $this->encodingOptions);
                 } catch (\Exception $e) {
diff --git a/src/Symfony/Component/Serializer/Encoder/JsonEncode.php b/src/Symfony/Component/Serializer/Encoder/JsonEncode.php
index 9b07d709b8cf..e5b48757dd0c 100644
--- a/src/Symfony/Component/Serializer/Encoder/JsonEncode.php
+++ b/src/Symfony/Component/Serializer/Encoder/JsonEncode.php
@@ -36,6 +36,11 @@ public function encode($data, $format, array $context = [])
     {
         $context = $this->resolveContext($context);
 
+        if (\PHP_VERSION_ID >= 70300 && (JSON_THROW_ON_ERROR & $context['json_encode_options'])) {
+            // Work around https://bugs.php.net/77997
+            json_encode(null);
+        }
+
         $encodedJson = json_encode($data, $context['json_encode_options']);
 
         if (JSON_ERROR_NONE !== json_last_error() && (false === $encodedJson || !($context['json_encode_options'] & JSON_PARTIAL_OUTPUT_ON_ERROR))) {
diff --git a/src/Symfony/Component/Translation/Dumper/JsonFileDumper.php b/src/Symfony/Component/Translation/Dumper/JsonFileDumper.php
index 3ee446dc7318..2a8d23d477e2 100644
--- a/src/Symfony/Component/Translation/Dumper/JsonFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/JsonFileDumper.php
@@ -31,6 +31,11 @@ public function formatCatalogue(MessageCatalogue $messages, $domain, array $opti
             $flags = \defined('JSON_PRETTY_PRINT') ? JSON_PRETTY_PRINT : 0;
         }
 
+        if (\PHP_VERSION_ID >= 70300 && (JSON_THROW_ON_ERROR & $flags)) {
+            // Work around https://bugs.php.net/77997
+            json_encode(null);
+        }
+
         return json_encode($messages->all($domain), $flags);
     }