diff --git a/CRM/Event/Form/Participant.php b/CRM/Event/Form/Participant.php
index 876e00809680..06216727c8fb 100644
--- a/CRM/Event/Form/Participant.php
+++ b/CRM/Event/Form/Participant.php
@@ -820,6 +820,7 @@ public static function formRule($values, $files, $self) {
       if (empty($values['payment_instrument_id'])) {
         $errorMsg['payment_instrument_id'] = ts('Payment Method is a required field.');
       }
+      CRM_Price_BAO_PriceField::priceSetValidation($values['priceSetId'], $values, $errorMsg);
     }
 
     // validate contribution status for 'Failed'.
diff --git a/CRM/Event/Form/Registration/Confirm.php b/CRM/Event/Form/Registration/Confirm.php
index f0f653cced72..155f8e6c1369 100644
--- a/CRM/Event/Form/Registration/Confirm.php
+++ b/CRM/Event/Form/Registration/Confirm.php
@@ -639,9 +639,9 @@ public function postProcess() {
           !$this->_allowWaitlist && !$this->_requireApproval
         ) {
           // transactionID & receive date required while building email template
-          $this->assign('trxn_id', $value['trxn_id']);
-          $this->assign('receive_date', CRM_Utils_Date::mysqlToIso($value['receive_date']));
-          $this->set('receiveDate', CRM_Utils_Date::mysqlToIso($value['receive_date']));
+          $this->assign('trxn_id', CRM_Utils_Array::value('trxn_id', $value));
+          $this->assign('receive_date', CRM_Utils_Date::mysqlToIso(CRM_Utils_Array::value('receive_date', $value)));
+          $this->set('receiveDate', CRM_Utils_Date::mysqlToIso(CRM_Utils_Array::value('receive_date', $value)));
           $this->set('trxnId', CRM_Utils_Array::value('trxn_id', $value));
         }
       }
diff --git a/CRM/Event/Form/Registration/Register.php b/CRM/Event/Form/Registration/Register.php
index 50999a089b56..6bc629a735ca 100644
--- a/CRM/Event/Form/Registration/Register.php
+++ b/CRM/Event/Form/Registration/Register.php
@@ -1015,6 +1015,7 @@ public function postProcess() {
         else {
           $submittedLineItems = array($lineItem);
         }
+        $submittedLineItems = array_filter($submittedLineItems);
         $this->set('lineItem', $submittedLineItems);
         $this->set('lineItemParticipantsCount', array($primaryParticipantCount));
       }
diff --git a/tests/phpunit/CRM/Event/Form/Registration/ConfirmTest.php b/tests/phpunit/CRM/Event/Form/Registration/ConfirmTest.php
index 1132dde1f6dc..d57e1eb6bd3c 100644
--- a/tests/phpunit/CRM/Event/Form/Registration/ConfirmTest.php
+++ b/tests/phpunit/CRM/Event/Form/Registration/ConfirmTest.php
@@ -164,4 +164,69 @@ public function testTaxMultipleParticipant() {
     $this->assertEquals($contribution['total_amount'], 440, 'Invalid Tax amount.');
   }
 
+  /**
+   * Test online registration for event with no price options selected as per CRM-19964.
+   */
+  public function testOnlineRegNoPrice() {
+    $paymentProcessorID = $this->processorCreate(array('is_default' => TRUE, 'user_name' => 'Test', 'is_test' => FALSE));
+    $paymentProcessorID = $this->processorCreate(array('is_default' => TRUE, 'user_name' => 'Test', 'is_test' => TRUE));
+    $params = array(
+      'start_date' => date('YmdHis', strtotime('+ 1 week')),
+      'end_date' => date('YmdHis', strtotime('+ 1 year')),
+      'registration_start_date' => date('YmdHis', strtotime('- 1 day')),
+      'registration_end_date' => date('YmdHis', strtotime('+ 1 year')),
+      'payment_processor_id' => $paymentProcessorID,
+      'is_monetary' => TRUE,
+      'financial_type_id' => 'Event Fee',
+    );
+    $event = $this->eventCreate($params);
+    $priceFieldOptions = array(
+      'option_label' => 'Price Field',
+      'option_value' => 100,
+      'is_required' => FALSE,
+      'html_type' => 'Text',
+    );
+    $this->createPriceSet('event', $event['id'], $priceFieldOptions);
+
+    $priceField = $this->callAPISuccess('PriceField', 'get',
+      array(
+        'label' => 'Price Field',
+      )
+    );
+    // Create online event registration.
+    CRM_Event_Form_Registration_Confirm::testSubmit(array(
+      'id' => $event['id'],
+      'contributeMode' => 'direct',
+      'registerByID' => $this->createLoggedInUser(),
+      'params' => array(
+        array(
+          'qfKey' => 'e6eb2903eae63d4c5c6cc70bfdda8741_2801',
+          'entryURL' => "http://dmaster.local/civicrm/event/register?reset=1&id={$event['id']}",
+          'first_name' => 'Bruce',
+          'last_name' => 'Wayne',
+          'email-Primary' => 'bruce@gotham.com',
+          'price_' . $priceField['id'] => '',
+          'priceSetId' => $priceField['values'][$priceField['id']]['price_set_id'],
+          'payment_processor_id' => $paymentProcessorID,
+          'amount' => 0,
+          'bypass_payment' => '',
+          'MAX_FILE_SIZE' => '33554432',
+          'is_primary' => 1,
+          'is_pay_later' => 0,
+          'campaign_id' => NULL,
+          'defaultRole' => 1,
+          'participant_role_id' => '1',
+          'tax_amount' => NULL,
+          'ip_address' => '127.0.0.1',
+          'invoiceID' => '57adc34957a29171948e8643ce906332',
+          'button' => '_qf_Register_upload',
+          'scriptFee' => '',
+          'scriptArray' => '',
+        ),
+      ),
+    ));
+    $contribution = $this->callAPISuccess('Contribution', 'get', array('invoice_id' => '57adc34957a29171948e8643ce906332'));
+    $this->assertEquals($contribution['count'], '0', "Contribution should not be created for zero fee event registration when no price field selected.");
+  }
+
 }
diff --git a/tests/phpunit/CiviTest/CiviUnitTestCase.php b/tests/phpunit/CiviTest/CiviUnitTestCase.php
index c4aba681eea5..5e41fc68dca8 100644
--- a/tests/phpunit/CiviTest/CiviUnitTestCase.php
+++ b/tests/phpunit/CiviTest/CiviUnitTestCase.php
@@ -3396,7 +3396,7 @@ protected function createParticipantWithContribution() {
    *
    * @return array
    */
-  protected function createPriceSet($component = 'contribution_page', $componentId = NULL) {
+  protected function createPriceSet($component = 'contribution_page', $componentId = NULL, $priceFieldOptions = array()) {
     $paramsSet['title'] = 'Price Set' . substr(sha1(rand()), 0, 7);
     $paramsSet['name'] = CRM_Utils_String::titleToVar($paramsSet['title']);
     $paramsSet['is_active'] = TRUE;
@@ -3408,7 +3408,7 @@ protected function createPriceSet($component = 'contribution_page', $componentId
     $this->assertDBCompareValue('CRM_Price_BAO_PriceSet', $priceSetId, 'title',
       'id', $paramsSet['title'], 'Check DB for created priceset'
     );
-    $paramsField = array(
+    $paramsField = array_merge(array(
       'label' => 'Price Field',
       'name' => CRM_Utils_String::titleToVar('Price Field'),
       'html_type' => 'CheckBox',
@@ -3424,7 +3424,8 @@ protected function createPriceSet($component = 'contribution_page', $componentId
       'price_set_id' => $priceSet['id'],
       'is_enter_qty' => 1,
       'financial_type_id' => $this->getFinancialTypeId('Event Fee'),
-    );
+    ), $priceFieldOptions);
+
     $priceField = CRM_Price_BAO_PriceField::create($paramsField);
     if ($componentId) {
       CRM_Price_BAO_PriceSet::addTo('civicrm_' . $component, $componentId, $priceSetId);