diff --git a/phpstan.neon b/phpstan.neon
index d8cac0d..fe6936b 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,4 +1,6 @@
 parameters:
-	ignoreErrors:
-		- '#stream_context_set_option invoked with 2 parameters, 4#'
-		- '#GusApi\\Client\\SoapClient does not have a constructor#'
\ No newline at end of file
+    reportUnmatchedIgnoredErrors: false
+    ignoreErrors:
+        - '#stream_context_set_option invoked with 2 parameters, 4#'
+        - '#GusApi\\Client\\SoapClient does not have a constructor#'
+        - '#Parameter \#1 $haystack of function stristr expects string, string|false given.#'
\ No newline at end of file
diff --git a/src/GusApi/Client/GusApiClient.php b/src/GusApi/Client/GusApiClient.php
index 8defaf9..14e4fd3 100644
--- a/src/GusApi/Client/GusApiClient.php
+++ b/src/GusApi/Client/GusApiClient.php
@@ -195,7 +195,7 @@ protected function call(string $functionName, $arguments, ?string $sid = null)
             'user_agent' => 'PHP GusApi',
         ]);
 
-        return $this->soapClient->__soapCall($functionName, $arguments, null, $soapHeaders);
+        return $this->soapClient->__soapCall($functionName, $arguments, [], $soapHeaders);
     }
 
     /**
diff --git a/tests/Client/GusApiClientTest.php b/tests/Client/GusApiClientTest.php
index f4cb1ef..6deaff1 100644
--- a/tests/Client/GusApiClientTest.php
+++ b/tests/Client/GusApiClientTest.php
@@ -221,7 +221,7 @@ protected function expectSoapCall(string $action, array $arguments, $result, boo
         $this->soap
             ->expects($this->once())
             ->method('__soapCall')
-            ->with($action, $arguments, null, $headers)
+            ->with($action, $arguments, [], $headers)
             ->willReturn($result);
     }
 }