diff --git a/CRM/Mailing/BAO/Mailing.php b/CRM/Mailing/BAO/Mailing.php
index d42201da88cf..f42b543eef1b 100644
--- a/CRM/Mailing/BAO/Mailing.php
+++ b/CRM/Mailing/BAO/Mailing.php
@@ -442,6 +442,8 @@ protected static function processWorkflowPermissions(array $params): array {
    * @param \CRM_Mailing_DAO_Mailing $mailing
    */
   protected static function doSubmitActions(array $params, CRM_Mailing_DAO_Mailing $mailing): void {
+    $params = self::ensureScheduledDate($params);
+
     // Create parent job if not yet created.
     // Condition on the existence of a scheduled date.
     if (!empty($params['scheduled_date']) && $params['scheduled_date'] !== 'null' && empty($params['_skip_evil_bao_auto_schedule_'])) {
@@ -475,6 +477,26 @@ protected static function doSubmitActions(array $params, CRM_Mailing_DAO_Mailing
     }
   }
 
+  /**
+   * Ensure scheduled_date is set when scheduled_id is present.
+   *
+   * A mailing with scheduled_id but no scheduled_date is an invalid state
+   * that prevents the mail scheduler from ever sending it. This guards
+   * against edge cases where scheduled_date is lost in the pipeline.
+   *
+   * @param array $params
+   * @return array
+   */
+  private static function ensureScheduledDate(array $params): array {
+    if (!empty($params['scheduled_id']) && (empty($params['scheduled_date']) || $params['scheduled_date'] === 'null')) {
+      Civi::log()->warning('Mailing: scheduled_id is set but scheduled_date is missing for mailing {id}. Defaulting to now.', [
+        'id' => $params['id'] ?? 'unknown',
+      ]);
+      $params['scheduled_date'] = CRM_Utils_Date::currentDBDate();
+    }
+    return $params;
+  }
+
   /**
    * Refresh the group cache for groups relevant to the mailing.
    *
@@ -988,6 +1010,7 @@ public static function add($params) {
     }
     // CRM-20892 Unset Modifed Date here so that MySQL can correctly set an updated modfied date.
     unset($params['modified_date']);
+    $params = self::ensureScheduledDate($params);
 
     $result = static::writeRecord($params);