core/lib/Drupal/Core/EventSubscriber/FinalExceptionSubscriber.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/lib/Drupal/Core/EventSubscriber/FinalExceptionSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/FinalExceptionSubscriber.php
index 2d6f022..4317ff0 100644
--- a/core/lib/Drupal/Core/EventSubscriber/FinalExceptionSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/FinalExceptionSubscriber.php
@@ -153,7 +153,7 @@ public static function getSubscribedEvents() {
    * @return bool
    */
   protected function isErrorLevelVerbose() {
-    return $this->getErrorLevel() != ERROR_REPORTING_DISPLAY_VERBOSE;
+    return $this->getErrorLevel() === ERROR_REPORTING_DISPLAY_VERBOSE;
   }
 
   /**
@@ -189,6 +189,7 @@ protected function simplifyFileInError($error) {
     if (substr($error['%file'], 0, $root_length) == DRUPAL_ROOT) {
       $error['%file'] = substr($error['%file'], $root_length + 1);
     }
+    return $error;
   }
 
 }