diff --git a/src/Wsdl/Event/RequestFailEvent.php b/src/Wsdl/Event/RequestFailEvent.php
index 65effcc..579d994 100644
--- a/src/Wsdl/Event/RequestFailEvent.php
+++ b/src/Wsdl/Event/RequestFailEvent.php
@@ -46,15 +46,23 @@ class RequestFailEvent implements Serializable
      */
     private $exceptionString;
 
+    /**
+     * @var array<int, array<string, mixed>> Zasobnik volanych funkci
+     */
+    private $trace;
+
+
     /**
      * @param string $fname Nazev volane funkce
      * @param array<int|string, mixed> $args  Argumenty pozadavku
+     * @param array<int, array<string, mixed>> $trace Zasobnik volanych funkci
      */
     public function __construct(
       string $fname,
       array $args,
       Throwable $throwable,
-      float $duration
+      float $duration,
+      array $trace
     ) {
         $this->fname = $fname;
         $this->args = $args;
@@ -62,6 +70,7 @@ public function __construct(
         $this->exceptionClass = get_class($throwable);
         $this->exceptionString = (string) $throwable;
         $this->time = $duration;
+        $this->trace = $trace;
     }
 
     /**
@@ -74,6 +83,7 @@ public function __serialize(): array {
             'time' => $this->time,
             'exception_class' =>  $this->exceptionClass,
             'exception_string' => $this->exceptionString,
+            'trace' => $this->trace,
         ];
     }
 
@@ -91,6 +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'];
     }
 
     /**
@@ -162,4 +173,11 @@ public function getThrowable(): ?Throwable
       return $this->throwable;
     }
 
+    /**
+     * @return array<int, array<string, mixed>>
+     */
+    public function getTrace(): array
+    {
+        return $this->trace;
+    }
 }
diff --git a/src/Wsdl/Event/RequestPostEvent.php b/src/Wsdl/Event/RequestPostEvent.php
index af28cc7..f00b9b9 100644
--- a/src/Wsdl/Event/RequestPostEvent.php
+++ b/src/Wsdl/Event/RequestPostEvent.php
@@ -32,21 +32,30 @@ class RequestPostEvent implements Serializable
      */
     private $result;
 
+    /**
+     * @var array<int, array<string, mixed>> Zasobnik volanych funkci
+     */
+    private $trace;
+
+
     /**
      * @param string $fname Nazev volane funkce
      * @param array<int|string, mixed> $args  Argumenty pozadavku
      * @param array<int|string, mixed>|stdClass|null $result
+     * @param array<int, array<string, mixed>> $trace Zasobnik volanych funkci
      */
     public function __construct(
       string $fname,
       array $args,
       $result,
-      float $duration
+      float $duration,
+      array $trace
     ) {
         $this->fname = $fname;
         $this->args = $args;
         $this->result = $result;
         $this->time = $duration;
+        $this->trace = $trace;
     }
 
     /**
@@ -59,6 +68,7 @@ public function __serialize(): array
             'args' => $this->args,
             'time' => $this->time,
             'result' => $this->result,
+            'trace' => $this->trace,
         ];
     }
 
@@ -76,6 +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'];
     }
 
     /**
@@ -116,4 +127,11 @@ public function getResult()
       return $this->result;
     }
 
+    /**
+     * @return array<int, array<string, mixed>>
+     */
+    public function getTrace(): array
+    {
+        return $this->trace;
+    }
 }
diff --git a/src/Wsdl/WebService.php b/src/Wsdl/WebService.php
index b1ef0d1..aba0135 100644
--- a/src/Wsdl/WebService.php
+++ b/src/Wsdl/WebService.php
@@ -88,9 +88,11 @@ protected function soapCall(
     ) {
         $fname = ucfirst($functionName);
         $args = $this->prepareArgs($fname, $arguments);
+        $trace = [];
 
         if ($this->eventDispatcher !== null) {
-            $event = new RequestPreEvent($fname, $args, $options, $inputHeaders, debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS));
+            $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
+            $event = new RequestPreEvent($fname, $args, $options, $inputHeaders, $trace);
             $this->eventDispatcher->dispatch($event);
         }
 
@@ -101,7 +103,7 @@ protected function soapCall(
 
             if ($this->eventDispatcher !== null) {
                 $duration = microtime(true) - $requestStart;
-                $event = new RequestPostEvent($fname, $args, $soapResponse, $duration);
+                $event = new RequestPostEvent($fname, $args, $soapResponse, $duration, $trace);
                 $this->eventDispatcher->dispatch($event);
             }
 
@@ -110,7 +112,7 @@ protected function soapCall(
 
             if ($this->eventDispatcher !== null) {
               $duration = microtime(true) - $requestStart;
-              $event = new RequestFailEvent($fname, $args, $t, $duration);
+              $event = new RequestFailEvent($fname, $args, $t, $duration, $trace);
               $this->eventDispatcher->dispatch($event);
             }
 
diff --git a/src/Wsdl/WebServiceFactory.php b/src/Wsdl/WebServiceFactory.php
index 530ef1a..55cab69 100644
--- a/src/Wsdl/WebServiceFactory.php
+++ b/src/Wsdl/WebServiceFactory.php
@@ -47,4 +47,16 @@ public function createWebService(string $url, array $options): WebServiceInterfa
         $soapClient = new \SoapClient($url, $options);
         return new $this->class($soapClient, $options, $this->eventDispatcher);
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function setEventDispatcher(EventDispatcherInterface $eventDispatcher): void
+    {
+        if ($this->eventDispatcher != null) {
+            throw new InvalidArgumentException("Event dispatcher is already set.");
+        }
+
+        $this->eventDispatcher = $eventDispatcher;
+    }
 }
diff --git a/src/Wsdl/WebServiceFactoryInterface.php b/src/Wsdl/WebServiceFactoryInterface.php
index d139b07..884744b 100644
--- a/src/Wsdl/WebServiceFactoryInterface.php
+++ b/src/Wsdl/WebServiceFactoryInterface.php
@@ -3,6 +3,8 @@
 
 namespace Skaut\Skautis\Wsdl;
 
+use Psr\EventDispatcher\EventDispatcherInterface;
+
 /**
  * Interface továrny pro vytváření objektů webových služeb
  */
@@ -18,4 +20,12 @@ interface WebServiceFactoryInterface
      * @return WebServiceInterface
      */
     public function createWebService(string $url, array $options): WebServiceInterface;
+
+    /**
+     * Nastaví event dispatcher, pokud uz neni nastaven.
+     *
+     * @param EventDispatcherInterface $eventDispatcher
+     * @return void
+     */
+    public function setEventDispatcher(EventDispatcherInterface $eventDispatcher): void;
 }
diff --git a/src/Wsdl/WsdlManager.php b/src/Wsdl/WsdlManager.php
index c50186e..a4a39cb 100644
--- a/src/Wsdl/WsdlManager.php
+++ b/src/Wsdl/WsdlManager.php
@@ -3,6 +3,7 @@
 
 namespace Skaut\Skautis\Wsdl;
 
+use Psr\EventDispatcher\EventDispatcherInterface;
 use Skaut\Skautis\Config;
 use Skaut\Skautis\User;
 
@@ -75,6 +76,13 @@ public function createWebService(string $name, array $options = []): WebServiceI
         return $this->webServiceFactory->createWebService($this->getWebServiceUrl($name), $options);
     }
 
+    /**
+     * Nastaví event dispatcher.
+     */
+    public function setEventDispatcher(EventDispatcherInterface $eventDispatcher): void {
+        $this->webServiceFactory->setEventDispatcher($eventDispatcher);
+    }
+
     /**
      * Vrací URL webové služby podle jejího jména
      */
diff --git a/tests/Unit/Wsdl/Event/RequestFailEventTest.php b/tests/Unit/Wsdl/Event/RequestFailEventTest.php
index 41f08b4..35e697a 100644
--- a/tests/Unit/Wsdl/Event/RequestFailEventTest.php
+++ b/tests/Unit/Wsdl/Event/RequestFailEventTest.php
@@ -17,8 +17,9 @@ class RequestFailEventTest extends TestCase
     public function testExceptionMessage(): void
     {
         $throwable = new RuntimeException('my message');
+        $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 
-        $event = new RequestFailEvent('asd', [], $throwable, 30);
+        $event = new RequestFailEvent('asd', [], $throwable, 30, $trace);
         $this->assertStringContainsString('my message', $event->getExceptionString());
         $this->assertSame(RuntimeException::class, $event->getExceptionClass());
     }
@@ -31,8 +32,9 @@ public function testDeserialization(): void
                 'argument' => 'value',
             ],
         ];
+        $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 
-        $event = new RequestFailEvent('asd', $args, $throwable, 30.22);
+        $event = new RequestFailEvent('asd', $args, $throwable, 30.22, $trace);
 
         $serialized = serialize($event);
         /** @var RequestFailEvent $unserialized */
@@ -56,8 +58,9 @@ public function testRepeatedSerializationDeserialization(): void
                 'argument' => 'value',
             ],
         ];
+        $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 
-        $event = new RequestFailEvent('asd', $args, $throwable, 30.22);
+        $event = new RequestFailEvent('asd', $args, $throwable, 30.22, $trace);
 
         $serialized = serialize($event);
         $unserialized = unserialize($serialized);
diff --git a/tests/Unit/Wsdl/Event/RequestPostEventTest.php b/tests/Unit/Wsdl/Event/RequestPostEventTest.php
index 351cbfa..b8a1959 100644
--- a/tests/Unit/Wsdl/Event/RequestPostEventTest.php
+++ b/tests/Unit/Wsdl/Event/RequestPostEventTest.php
@@ -21,8 +21,9 @@ public function testDeserialize(): void
         ];
         $result = [(object)['a' => 'b']];
         $duration = 11.11;
+        $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
 
-        $event = new RequestPostEvent('asd', $args, $result, $duration);
+        $event = new RequestPostEvent('asd', $args, $result, $duration, $trace);
 
         $serialized = serialize($event);
         /** @var RequestPostEvent $unserialized */