diff --git a/core/modules/system/src/Plugin/Condition/RequestPath.php b/core/modules/system/src/Plugin/Condition/RequestPath.php
index 9b4bd474d1..2d3c8f0fb2 100644
--- a/core/modules/system/src/Plugin/Condition/RequestPath.php
+++ b/core/modules/system/src/Plugin/Condition/RequestPath.php
@@ -118,7 +118,10 @@ public function buildConfigurationForm(array $form, FormStateInterface $form_sta
   public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
     $paths = array_map('trim', explode("\n", $form_state->getValue('pages')));
     foreach ($paths as $path) {
-      if (empty($path) || $path === '<front>' || str_starts_with($path, '/')) {
+      // Added extra condition to IF statement to allow for '!/' to be used as I can not think of any other way
+      // to allow for the use of the '!' character in the path overwire with custom modules.
+      // This is needed for contrubuted modules: 'https://www.drupal.org/project/block_exclude_pages'
+      if (empty($path) || $path === '<front>' || str_starts_with($path, '/') || str_starts_with($path, '!/') ) {
         continue;
       }
       $form_state->setErrorByName('pages', $this->t("The path %path requires a leading forward slash when used with the Pages setting.", ['%path' => $path]));