diff --git a/src/Command/KimaiImporterCommand.php b/src/Command/KimaiImporterCommand.php
index f0a4cdfb..a790f549 100644
--- a/src/Command/KimaiImporterCommand.php
+++ b/src/Command/KimaiImporterCommand.php
@@ -830,9 +830,9 @@ class KimaiImporterCommand extends Command
         $activity = new Activity();
         $activity
             ->setName($name)
-            ->setComment($oldActivity['comment'] ?: null)
+            ->setComment($oldActivity['comment'] ?? null)
             ->setVisible($isActive)
-            ->setBudget($oldActivity['budget'] ?: 0)
+            ->setBudget($oldActivity['budget'] ?? 0)
         ;
 
         if (null !== $projectId) {
@@ -1059,7 +1059,7 @@ class KimaiImporterCommand extends Command
             // ---------------------------------------------------------------------
 
             $timesheet
-                ->setDescription($oldRecord['description'] ?: ($oldRecord['comment'] ?: null))
+                ->setDescription($oldRecord['description'] ?? ($oldRecord['comment'] ?? null))
                 ->setUser($this->users[$oldRecord['userID']])
                 ->setBegin($begin)
                 ->setEnd($end)