diff --git a/ext/soap/tests/SoapClient/setSoapHeaders-invalid-headers.phpt b/ext/soap/tests/SoapClient/setSoapHeaders-invalid-headers.phpt
new file mode 100644
index 00000000000..1c1d69d9a7d
--- /dev/null
+++ b/ext/soap/tests/SoapClient/setSoapHeaders-invalid-headers.phpt
@@ -0,0 +1,28 @@
+--TEST--
+SoapClient::__soapCall with invalid headers
+--EXTENSIONS--
+soap
+--FILE--
+<?php
+
+/* Bypass constructor */
+class ExtendedSoapClient extends SoapClient {
+    public function __construct() {}
+}
+
+$client = new ExtendedSoapClient();
+$header = new SoapHeader('namespace', 'name');
+$headers = [
+    $header,
+    'giberrish',
+];
+
+try {
+    $client->__setSoapHeaders($headers);
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), PHP_EOL;
+}
+
+?>
+--EXPECTF--
+Fatal error: SoapClient::__setSoapHeaders(): Invalid SOAP header in %s on line %d
diff --git a/ext/soap/tests/SoapClient/soapCall-invalid-headers.phpt b/ext/soap/tests/SoapClient/soapCall-invalid-headers.phpt
new file mode 100644
index 00000000000..f9cc11fd60f
--- /dev/null
+++ b/ext/soap/tests/SoapClient/soapCall-invalid-headers.phpt
@@ -0,0 +1,28 @@
+--TEST--
+SoapClient::__soapCall with invalid headers
+--EXTENSIONS--
+soap
+--FILE--
+<?php
+
+/* Bypass constructor */
+class ExtendedSoapClient extends SoapClient {
+    public function __construct() {}
+}
+
+$client = new ExtendedSoapClient();
+$header = new SoapHeader('namespace', 'name');
+$headers = [
+    $header,
+    'giberrish',
+];
+
+try {
+    $client->__soapCall('function', ['arg'], ['options'], $headers);
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), PHP_EOL;
+}
+
+?>
+--EXPECTF--
+Fatal error: SoapClient::__soapCall(): Invalid SOAP header in %s on line %d