diff --git a/src/Symfony/Component/Console/Helper/ProgressBar.php b/src/Symfony/Component/Console/Helper/ProgressBar.php
index 4c883ac04bc9d..f6b3323d59f4d 100644
--- a/src/Symfony/Component/Console/Helper/ProgressBar.php
+++ b/src/Symfony/Component/Console/Helper/ProgressBar.php
@@ -50,7 +50,8 @@ final class ProgressBar
     private OutputInterface $output;
     private int $step = 0;
     private int $startingStep = 0;
-    private ?int $max = null;
+    private int $max = 0;
+    private bool $isMaxKnown = false;
     private int $startTime;
     private int $stepWidth;
     private float $percent = 0.0;
@@ -195,7 +196,7 @@ public function getProgressPercent(): float
 
     public function getBarOffset(): float
     {
-        return floor($this->max ? $this->percent * $this->barWidth : (null === $this->redrawFreq ? (int) (min(5, $this->barWidth / 15) * $this->writeCount) : $this->step) % $this->barWidth);
+        return floor($this->isMaxKnown || $this->max ? $this->percent * $this->barWidth : (null === $this->redrawFreq ? (int) (min(5, $this->barWidth / 15) * $this->writeCount) : $this->step) % $this->barWidth);
     }
 
     public function getEstimated(): float
@@ -209,7 +210,7 @@ public function getEstimated(): float
 
     public function getRemaining(): float
     {
-        if (!$this->step) {
+        if (!$this->step || $this->step === $this->startingStep) {
             return 0;
         }
 
@@ -233,7 +234,7 @@ public function setBarCharacter(string $char)
 
     public function getBarCharacter(): string
     {
-        return $this->barChar ?? ($this->max ? '=' : $this->emptyBarChar);
+        return $this->barChar ?? ($this->isMaxKnown || $this->max ? '=' : $this->emptyBarChar);
     }
 
     public function setEmptyBarCharacter(string $char)
@@ -289,6 +290,8 @@ public function maxSecondsBetweenRedraws(float $seconds): void
      */
     public function iterate(iterable $iterable, int $max = null): iterable
     {
+        $this->isMaxKnown = is_countable($iterable);
+
         $this->start($max ?? (is_countable($iterable) ? \count($iterable) : 0));
 
         foreach ($iterable as $key => $value) {
@@ -308,6 +311,8 @@ public function iterate(iterable $iterable, int $max = null): iterable
      */
     public function start(int $max = null, int $startAt = 0): void
     {
+        $this->isMaxKnown = !is_null($max);
+
         $this->startTime = time();
         $this->step = $startAt;
         $this->startingStep = $startAt;
@@ -352,6 +357,8 @@ public function setProgress(int $step)
         $currPeriod = (int) ($step / $redrawFreq);
         $this->step = $step;
         $this->percent = $this->max ? (float) $this->step / $this->max : 0;
+        if ($this->isMaxKnown && 0 == $this->max)
+            $this->percent = 1.0;
         $timeInterval = microtime(true) - $this->lastWriteTime;
 
         // Draw regardless of other limits
@@ -377,6 +384,7 @@ public function setMaxSteps(int $max)
         $this->format = null;
         $this->max = max(0, $max);
         $this->stepWidth = $this->max ? Helper::width((string) $this->max) : 4;
+        $this->isMaxKnown = $this->isMaxKnown || 0 < $this->max;
     }
 
     /**
@@ -519,14 +527,14 @@ private static function initPlaceholderFormatters(): array
                 return Helper::formatTime(time() - $bar->getStartTime());
             },
             'remaining' => function (self $bar) {
-                if (!$bar->getMaxSteps()) {
+                if (!$bar->isMaxKnown && !$bar->getMaxSteps()) {
                     throw new LogicException('Unable to display the remaining time if the maximum number of steps is not set.');
                 }
 
                 return Helper::formatTime($bar->getRemaining());
             },
             'estimated' => function (self $bar) {
-                if (!$bar->getMaxSteps()) {
+                if (!$bar->isMaxKnown && !$bar->getMaxSteps()) {
                     throw new LogicException('Unable to display the estimated time if the maximum number of steps is not set.');
                 }
 
diff --git a/src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php b/src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php
index f9a74ae761879..dea640ffd22a8 100644
--- a/src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Tests\Helper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\Definition\Exception\Exception;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Helper\Helper;
 use Symfony\Component\Console\Helper\ProgressBar;
@@ -1037,6 +1038,29 @@ public function testIterateUncountable()
         );
     }
 
+    public function testEmptyInputWithDebugFormat()
+    {
+        try {
+            $bar = new ProgressBar($output = $this->getOutputStream());
+            $bar->setFormat('%current%/%max% [%bar%] %percent:3s%% %elapsed:6s%/%estimated:-6s%');
+
+            $input = [];
+            foreach ($bar->iterate($input) as $item) {
+                var_dump($item);
+            }
+
+            // succeed the test if we reach this code (no exception happened)
+            rewind($output->getStream());
+            $this->assertEquals(
+                '   0/0 [>---------------------------]   0% < 1 sec/< 1 sec' .
+                $this->generateOutput('   0/0 [============================] 100% < 1 sec/< 1 sec'),
+                stream_get_contents($output->getStream())
+            );
+        } catch (Exception $e) {
+            $this->fail();
+        }
+    }
+
     protected function getOutputStream($decorated = true, $verbosity = StreamOutput::VERBOSITY_NORMAL)
     {
         return new StreamOutput(fopen('php://memory', 'r+', false), $verbosity, $decorated);