diff --git a/src/CliProgram/Validation/TCommandWithValidation.php b/src/CliProgram/Validation/TCommandWithValidation.php
index f32bb12..d6fb186 100644
--- a/src/CliProgram/Validation/TCommandWithValidation.php
+++ b/src/CliProgram/Validation/TCommandWithValidation.php
@@ -58,12 +58,29 @@ trait TCommandWithValidation {
      */
     protected function validateArguments (InputInterface $input, OutputInterface $output): void {
         foreach ($this->argumentsValidator as $argumentName => $argumentValidator) {
-            if ($input->hasArgument($argumentName)) {
-                if (!$argumentValidator->validate($input->getArgument($argumentName))) {
-                    throw new InvalidValueException(sprintf('The "%s" argument has not a valid value', $argumentName));
-                }
-                $input->setArgument($argumentName, $argumentValidator->getValue());
+            //region Check the argument still exists
+            if (!$input->hasArgument($argumentName)) {
+                continue;
             }
+            //endregion
+            //region Get the argument value
+            $argumentValue = $input->getArgument($argumentName);
+            //endregion
+            //region Check the argument value is not Null
+            if ($argumentValue === null) {
+                // If the value is strictly Null (the default value), don't check it → skip
+                continue;
+            }
+            //endregion
+
+            //region Check the value is valid
+            if (!$argumentValidator->validate($argumentValue)) {
+                throw new InvalidValueException(sprintf('The "%s" argument has not a valid value', $argumentName));
+            }
+            //endregion
+            //region Replace the value by the one extracted from the validator
+            $input->setArgument($argumentName, $argumentValidator->getValue());
+            //endregion
         }
     }
     /**
@@ -78,12 +95,29 @@ trait TCommandWithValidation {
      */
     protected function validateOptions (InputInterface $input, OutputInterface $output): void {
         foreach ($this->optionsValidator as $optionName => $optionValidator) {
-            if ($input->hasOption($optionName)) {
-                if (!$optionValidator->validate($input->getOption($optionName))) {
-                    throw new InvalidValueException(sprintf('The "--%s" option has not a valid value', $optionName));
-                }
-                $input->setOption($optionName, $optionValidator->getValue());
+            //region Check the option still exists
+            if (!$input->hasOption($optionName)) {
+                continue;
+            }
+            //endregion
+            //region Get and check the option value
+            $optionValue = $input->getOption($optionName);
+            //endregion
+            //region Check the option value is NOT Null or False
+            if ($optionValue === null || $optionValue === false) {
+                // If the value is strictly Null (the default value or not provided) or False (the default value), don't check it → skip
+                continue;
+            }
+            //endregion
+
+            //region Check the value is valid
+            if (!$optionValidator->validate($optionValue)) {
+                throw new InvalidValueException(sprintf('The "--%s" option has not a valid value', $optionName));
             }
+            //endregion
+            //region Replace the value by the one extracted from the validator
+            $input->setOption($optionName, $optionValidator->getValue());
+            //endregion
         }
     }
 
diff --git a/tests/Commands/Hello.php b/tests/Commands/Hello.php
index 08bbb24..1412e16 100644
--- a/tests/Commands/Hello.php
+++ b/tests/Commands/Hello.php
@@ -11,6 +11,7 @@ use jrosset\CliProgram\Validation\Validators\IntegerValidator;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 
 class Hello extends CommandWithValidation {
@@ -43,7 +44,7 @@ class Hello extends CommandWithValidation {
         $this->addOption(
             'repeat',
             'r',
-            InputArgument::OPTIONAL,
+            InputOption::VALUE_OPTIONAL,
             'The number of repeat',
             1,
             new IntegerValidator(1, null)