diff --git a/src/Wsdl/Event/RequestFailEvent.php b/src/Wsdl/Event/RequestFailEvent.php
index 915d617..579d994 100644
--- a/src/Wsdl/Event/RequestFailEvent.php
+++ b/src/Wsdl/Event/RequestFailEvent.php
@@ -83,6 +83,7 @@ public function __serialize(): array {
             'time' => $this->time,
             'exception_class' =>  $this->exceptionClass,
             'exception_string' => $this->exceptionString,
+            'trace' => $this->trace,
         ];
     }
 
@@ -100,6 +101,7 @@ public function __unserialize(array $data): void {
         $this->time = (float) $data['time'];
         $this->exceptionClass = (string) $data['exception_class'];
         $this->exceptionString = (string) $data['exception_string'];
+        $this->trace = (array) $data['trace'];
     }
 
     /**
diff --git a/src/Wsdl/Event/RequestPostEvent.php b/src/Wsdl/Event/RequestPostEvent.php
index bab34d8..f00b9b9 100644
--- a/src/Wsdl/Event/RequestPostEvent.php
+++ b/src/Wsdl/Event/RequestPostEvent.php
@@ -68,6 +68,7 @@ public function __serialize(): array
             'args' => $this->args,
             'time' => $this->time,
             'result' => $this->result,
+            'trace' => $this->trace,
         ];
     }
 
@@ -85,6 +86,7 @@ public function __unserialize(array $data): void
         $this->args = (array) $data['args'];
         $this->time = (float) $data['time'];
         $this->result = (array) $data['result'];
+        $this->trace = (array) $data['trace'];
     }
 
     /**