Update TaxonomyDeleteForm.php

I updated the code to resolve the issue.

src/Form/TaxonomyDeleteForm.php

@@ -146,6 +146,11 @@ protected $moduleHandler;
   }
 
   protected function getTableRows() {
+
+    if (empty($unused_tids)) {
+      return [];
+    }
+
     $request = $this->requestStack->getCurrentRequest();
     // The code from controller that fetches and prepares term data for the table rows.
     // Load all terms.
@@ -388,6 +393,15 @@ protected $moduleHandler;
     }
   }
 
+    protected function getUnusedTermIds() {      
+      $query = $this->entityTypeManager->getStorage('taxonomy_term')->getQuery()
+          ->condition('status', 1)
+          ->pager(5)
+          ->accessCheck(FALSE);
+
+      return $query->execute();
+    }
+
   public function submitForm( array &$form, FormStateInterface $form_state ) {
     $selected_terms = array_filter( $form_state->getValue('table') );
     if ( !empty( $selected_terms ) ) {
@@ -403,4 +417,4 @@ protected $moduleHandler;
       $this->messenger()->addWarning( $this->t( 'No Term Selected' ) );
     }
   }
-}
\ No newline at end of file
+}