diff --git a/Command/ListCommand.php b/Command/ListCommand.php
index 8af266aa..b4eb5a6c 100644
--- a/Command/ListCommand.php
+++ b/Command/ListCommand.php
@@ -23,7 +23,9 @@ class ListCommand extends Command
 {
     private ObjectManager $em;
 
-    public function __construct(ManagerRegistry $managerRegistry, private readonly DateTimeFormatter $dateTimeFormatter, string $managerName)
+    public function __construct(ManagerRegistry                         $managerRegistry,
+                                private readonly DateTimeFormatter|null $dateTimeFormatter,
+                                string                                  $managerName)
     {
         $this->em = $managerRegistry->getManager($managerName);
         parent::__construct();
@@ -38,6 +40,17 @@ protected function configure(): void
             ->setHelp('This class is for listing all active commands.');
     }
 
+    // https://github.com/Dukecity/CommandSchedulerBundle/issues/99
+    private function formatDiff(\DateTime $dateTime): string
+    {
+        if($this->dateTimeFormatter)
+        {
+            return $this->dateTimeFormatter->formatDiff($dateTime);
+        }
+
+        return $dateTime->format('Y-m-d H:i');
+    }
+
     /**
      * @throws \Exception
      */
@@ -64,11 +77,11 @@ protected function execute(InputInterface $input, OutputInterface $output): int
                 };
 
                 if($nextRunDate = $command->getNextRunDate())
-                {$nextRunDateText = $this->dateTimeFormatter->formatDiff($nextRunDate);}
+                {$nextRunDateText = $this->formatDiff($nextRunDate);}
                 else {$nextRunDateText = "";}
 
                 if($lastRunDate = $command->getLastExecution())
-                {$lastRunDateText = $this->dateTimeFormatter->formatDiff($lastRunDate);}
+                {$lastRunDateText = $this->formatDiff($lastRunDate);}
                 else {$lastRunDateText = "";}
 
                 $table->addRow([
diff --git a/Command/MonitorCommand.php b/Command/MonitorCommand.php
index fa8b6afe..1be3da03 100644
--- a/Command/MonitorCommand.php
+++ b/Command/MonitorCommand.php
@@ -37,7 +37,7 @@ class MonitorCommand extends Command
     public function __construct(
         private EventDispatcherInterface $eventDispatcher,
         ManagerRegistry $managerRegistry,
-        private readonly DateTimeFormatter $dateTimeFormatter,
+        private readonly DateTimeFormatter|null $dateTimeFormatter,
         string $managerName,
         private int | bool $lockTimeout,
         private array $receiver,
@@ -103,6 +103,17 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         return Command::SUCCESS;
     }
 
+    // https://github.com/Dukecity/CommandSchedulerBundle/issues/99
+    private function formatDiff(\DateTime $dateTime): string
+    {
+        if($this->dateTimeFormatter)
+        {
+           return $this->dateTimeFormatter->formatDiff($dateTime);
+        }
+
+        return '';
+    }
+
     /**
      * Print a table of locked Commands to console.
      *
@@ -133,7 +144,7 @@ private function dump(OutputInterface $output, array $failedCommands): void
             if($lastRunDate)
             {
                 $lastRunDateText = $lastRunDate->format('Y-m-d H:i').' ('
-                    .$this->dateTimeFormatter->formatDiff($command->getLastExecution()).')';
+                    .$this->formatDiff($command->getLastExecution()).')';
             }
             else {
                 $lastRunDateText = '';
@@ -143,7 +154,7 @@ private function dump(OutputInterface $output, array $failedCommands): void
             if($nextRunDate)
             {
                 $nextRunDateText = $nextRunDate->format('Y-m-d H:i').' ('
-                 .$this->dateTimeFormatter->formatDiff($command->getLastExecution()).')';
+                 .$this->formatDiff($command->getLastExecution()).')';
             }
             else {
                 $nextRunDateText = '';
diff --git a/Resources/config/services.php b/Resources/config/services.php
index 50fbc0d3..2599ce9a 100644
--- a/Resources/config/services.php
+++ b/Resources/config/services.php
@@ -101,7 +101,7 @@
             [
                 service('event_dispatcher'),
                 service('doctrine'),
-                service('time.datetime_formatter'),
+                service('time.datetime_formatter')->nullOnInvalid(),
                 '%dukecity_command_scheduler.doctrine_manager%',
                 '%dukecity_command_scheduler.lock_timeout%',
                 '%dukecity_command_scheduler.monitor_mail%',
@@ -115,7 +115,7 @@
         ->args(
             [
                 service('doctrine'),
-                service('time.datetime_formatter'),
+                service('time.datetime_formatter')->nullOnInvalid(),
                 '%dukecity_command_scheduler.doctrine_manager%',
             ]
         )