diff --git a/lib/Cron/DaemonHttpRunner.php b/lib/Cron/DaemonHttpRunner.php
index 0c104be5d0..78e7caf191 100644
--- a/lib/Cron/DaemonHttpRunner.php
+++ b/lib/Cron/DaemonHttpRunner.php
@@ -4,6 +4,7 @@ namespace MailPoet\Cron;
 use MailPoet\Cron\Triggers\WordPress;
 use MailPoet\Settings\SettingsController;
 use MailPoet\WP\Functions as WPFunctions;
+use Tracy\Debugger;
 
 if (!defined('ABSPATH')) exit;
 
@@ -30,6 +31,12 @@ class DaemonHttpRunner {
   }
 
   function ping() {
+    // if Tracy enabled & called by 'MailPoet Cron' user agent, disable Tracy Bar
+    // (happens in CronHelperTest because it's not a real integration test - calls other WP instance)
+    $user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : null;
+    if (class_exists(Debugger::class) && $user_agent === 'MailPoet Cron') {
+      Debugger::$showBar = false;
+    }
     $this->addCacheHeaders();
     $this->terminateRequest(self::PING_SUCCESS_RESPONSE);
   }
diff --git a/mailpoet_initializer.php b/mailpoet_initializer.php
index 46809be10b..1a2b785b60 100644
--- a/mailpoet_initializer.php
+++ b/mailpoet_initializer.php
@@ -12,17 +12,21 @@ $tracy_path = __DIR__ . '/tools/tracy.phar';
 if (WP_DEBUG && PHP_VERSION_ID >= 70100 && file_exists($tracy_path)) {
   require_once $tracy_path;
 
-  function render_tracy() {
-    ob_start();
-    Debugger::renderLoader();
-    $tracy_script_html = ob_get_clean();
+  if (getenv('MAILPOET_DISABLE_TRACY_BAR')) {
+    Debugger::$showBar = false;
+  } else {
+    function render_tracy() {
+      ob_start();
+      Debugger::renderLoader();
+      $tracy_script_html = ob_get_clean();
 
-    // strip 'async' to ensure all AJAX request are caught
-    // (even when fired immediately after page starts loading)
-    echo str_replace('async', '', $tracy_script_html);
-  };
-  add_action('admin_enqueue_scripts', 'render_tracy', PHP_INT_MAX, 0);
-  session_start();
+      // strip 'async' to ensure all AJAX request are caught
+      // (even when fired immediately after page starts loading)
+      return str_replace('async', '', $tracy_script_html);
+    }
+    add_action('admin_enqueue_scripts', 'render_tracy', PHP_INT_MAX, 0);
+    session_start();
+  }
   Debugger::enable(Debugger::DEVELOPMENT);
 }
 
diff --git a/tests/docker/docker-compose.yml b/tests/docker/docker-compose.yml
index 5357f90c06..aabf4761c4 100644
--- a/tests/docker/docker-compose.yml
+++ b/tests/docker/docker-compose.yml
@@ -42,6 +42,8 @@ services:
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_NAME: wordpress
       WORDPRESS_TABLE_PREFIX: mp_
+      MAILPOET_DISABLE_TRACY_BAR: 1
+
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost"]
       interval: 1m30s