diff --git a/app/code/Magento/Captcha/Observer/CheckUserEditObserver.php b/app/code/Magento/Captcha/Observer/CheckUserEditObserver.php
index 9d3cd8d367093..a3921b6cb17aa 100644
--- a/app/code/Magento/Captcha/Observer/CheckUserEditObserver.php
+++ b/app/code/Magento/Captcha/Observer/CheckUserEditObserver.php
@@ -111,19 +111,21 @@ public function execute(\Magento\Framework\Event\Observer $observer)
                 )
             )) {
                 $customerId = $this->customerSession->getCustomerId();
-                $this->authentication->processAuthenticationFailure($customerId);
-                if ($this->authentication->isLocked($customerId)) {
-                    $this->customerSession->logout();
-                    $this->customerSession->start();
-                    $message = __(
-                        'The account is locked. Please wait and try again or contact %1.',
-                        $this->scopeConfig->getValue('contact/email/recipient_email')
-                    );
-                    $this->messageManager->addError($message);
+                if ($customerId) {
+                    $this->authentication->processAuthenticationFailure($customerId);
+                    if ($this->authentication->isLocked($customerId)) {
+                        $this->customerSession->logout();
+                        $this->customerSession->start();
+                        $message = __(
+                            'The account is locked. Please wait and try again or contact %1.',
+                            $this->scopeConfig->getValue('contact/email/recipient_email')
+                        );
+                        $this->messageManager->addError($message);
+                    }
+                    $this->messageManager->addError(__('Incorrect CAPTCHA'));
+                    $this->actionFlag->set('', \Magento\Framework\App\Action\Action::FLAG_NO_DISPATCH, true);
+                    $this->redirect->redirect($controller->getResponse(), '*/*/edit');
                 }
-                $this->messageManager->addError(__('Incorrect CAPTCHA'));
-                $this->actionFlag->set('', \Magento\Framework\App\Action\Action::FLAG_NO_DISPATCH, true);
-                $this->redirect->redirect($controller->getResponse(), '*/*/edit');
             }
         }
 
diff --git a/app/code/Magento/Captcha/Test/Unit/Observer/CheckUserEditObserverTest.php b/app/code/Magento/Captcha/Test/Unit/Observer/CheckUserEditObserverTest.php
index 26fd8fd928c56..ee5001d146793 100644
--- a/app/code/Magento/Captcha/Test/Unit/Observer/CheckUserEditObserverTest.php
+++ b/app/code/Magento/Captcha/Test/Unit/Observer/CheckUserEditObserverTest.php
@@ -160,4 +160,53 @@ public function testExecute()
 
         $this->observer->execute(new \Magento\Framework\Event\Observer(['controller_action' => $controller]));
     }
+
+    /**
+     * @return void
+     */
+    public function testExecuteWithCustomerIdNull()
+    {
+        $customerId = null;
+        $captchaValue = 'some-value';
+
+        $captcha = $this->createMock(\Magento\Captcha\Model\DefaultModel::class);
+        $captcha->expects($this->once())
+            ->method('isRequired')
+            ->willReturn(true);
+        $captcha->expects($this->once())
+            ->method('isCorrect')
+            ->with($captchaValue)
+            ->willReturn(false);
+
+        $this->helperMock->expects($this->once())
+            ->method('getCaptcha')
+            ->with(\Magento\Captcha\Observer\CheckUserEditObserver::FORM_ID)
+            ->willReturn($captcha);
+
+        $request = $this->createMock(\Magento\Framework\App\Request\Http::class);
+        $request->expects($this->any())
+            ->method('getPost')
+            ->with(\Magento\Captcha\Helper\Data::INPUT_NAME_FIELD_VALUE, null)
+            ->willReturn([\Magento\Captcha\Observer\CheckUserEditObserver::FORM_ID => $captchaValue]);
+
+        $controller = $this->createMock(\Magento\Framework\App\Action\Action::class);
+        $controller->expects($this->any())->method('getRequest')->will($this->returnValue($request));
+
+        $this->captchaStringResolverMock->expects($this->once())
+            ->method('resolve')
+            ->with($request, \Magento\Captcha\Observer\CheckUserEditObserver::FORM_ID)
+            ->willReturn($captchaValue);
+
+        $customerDataMock = $this->createMock(\Magento\Customer\Model\Data\Customer::class);
+
+        $this->customerSessionMock->expects($this->once())
+            ->method('getCustomerId')
+            ->willReturn($customerId);
+
+        $this->customerSessionMock->expects($this->atLeastOnce())
+            ->method('getCustomer')
+            ->willReturn($customerDataMock);
+
+        $this->observer->execute(new \Magento\Framework\Event\Observer(['controller_action' => $controller]));
+    }
 }