diff --git a/plugins/sampledata/blog/blog.php b/plugins/sampledata/blog/blog.php
index 75edacc951163..f0cc29e60cfac 100644
--- a/plugins/sampledata/blog/blog.php
+++ b/plugins/sampledata/blog/blog.php
@@ -119,6 +119,9 @@ public function onAjaxSampledataApplyStep1()
 		$language   = Multilanguage::isEnabled() ? Factory::getLanguage()->getTag() : '*';
 		$langSuffix = ($language !== '*') ? ' (' . $language . ')' : '';
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		/** @var \Joomla\Component\Tags\Administrator\Model\TagModel $model */
 		$modelTag = $this->app->bootComponent('com_tags')->getMVCFactory()->createModel('Tag', 'Administrator', ['ignore_request' => true]);
 
@@ -834,6 +837,9 @@ public function onAjaxSampledataApplyStep2()
 		$language   = Multilanguage::isEnabled() ? Factory::getLanguage()->getTag() : '*';
 		$langSuffix = ($language !== '*') ? ' (' . $language . ')' : '';
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		// Create the menu types.
 		$menuTable = new \Joomla\Component\Menus\Administrator\Table\MenuTypeTable($this->db);
 		$menuTypes = array();
@@ -1407,6 +1413,9 @@ public function onAjaxSampledataApplyStep3()
 		$language   = Multilanguage::isEnabled() ? Factory::getLanguage()->getTag() : '*';
 		$langSuffix = ($language !== '*') ? ' (' . $language . ')' : '';
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		// Add Include Paths.
 		$model  = new \Joomla\Component\Modules\Administrator\Model\ModuleModel;
 		$access = (int) $this->app->get('access', 1);
diff --git a/plugins/sampledata/testing/testing.php b/plugins/sampledata/testing/testing.php
index 775f2ab9d007b..d1397f41c410f 100644
--- a/plugins/sampledata/testing/testing.php
+++ b/plugins/sampledata/testing/testing.php
@@ -112,6 +112,9 @@ public function onAjaxSampledataApplyStep1()
 			return $response;
 		}
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		/** @var \Joomla\Component\Tags\Administrator\Model\TagModel $model */
 		$model = $this->app->bootComponent('com_tags')->getMVCFactory()->createModel('Tag', 'Administrator', ['ignore_request' => true]);
 		$access = (int) $this->app->get('access', 1);
@@ -220,6 +223,9 @@ public function onAjaxSampledataApplyStep2()
 			return $response;
 		}
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		$factory = $this->app->bootComponent('com_banners')->getMVCFactory();
 
 		/** @var Joomla\Component\Banners\Administrator\Model\ClientModel $clientModel */
@@ -400,6 +406,9 @@ public function onAjaxSampledataApplyStep3()
 			return $response;
 		}
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		// Insert first level of categories.
 		$categories   = array();
 		$categories[] = array(
@@ -1050,6 +1059,9 @@ public function onAjaxSampledataApplyStep5()
 			return $response;
 		}
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		$model  = $this->app->bootComponent('com_contact')->getMVCFactory()->createModel('Contact', 'Administrator', ['ignore_request' => true]);
 		$access = (int) $this->app->get('access', 1);
 		$user   = Factory::getUser();
@@ -1402,6 +1414,9 @@ public function onAjaxSampledataApplyStep6()
 			return $response;
 		}
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		/** @var \Joomla\Component\Newsfeeds\Administrator\Model\NewsfeedModel $model */
 		$model  = $this->app->bootComponent('com_newsfeeds')->getMVCFactory()->createModel('Newsfeed', 'Administrator', ['ignore_request' => true]);
 		$access = (int) $this->app->get('access', 1);
@@ -1530,6 +1545,9 @@ public function onAjaxSampledataApplyStep7()
 			return $response;
 		}
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		/** @var \Joomla\Component\Menus\Administrator\Model\MenuModel $model */
 		$factory = $this->app->bootComponent('com_menus')->getMVCFactory();
 		$model = $factory->createModel('Menu', 'Administrator', ['ignore_request' => true]);
@@ -3242,6 +3260,9 @@ public function onAjaxSampledataApplyStep8()
 			return $response;
 		}
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		$model = $this->app->bootComponent('com_modules')->getMVCFactory()->createModel('Module', 'Administrator', ['ignore_request' => true]);
 		$access = (int) $this->app->get('access', 1);
 
@@ -4621,6 +4642,9 @@ private function addArticles(array $articles)
 		$user   = Factory::getUser();
 		$mvcFactory = $this->app->bootComponent('com_content')->getMVCFactory();
 
+		// Set debugging to false to prevent saving of prepend/appended debug_lang_const
+		Factory::getLanguage()->setDebug(false);
+
 		foreach ($articles as $i => $article)
 		{
 			/** @var \Joomla\Component\Content\Administrator\Model\ArticleModel $model */