diff --git a/Descriptor/TextDescriptor.php b/Descriptor/TextDescriptor.php
index ccfbd6d36..16ab3eb55 100644
--- a/Descriptor/TextDescriptor.php
+++ b/Descriptor/TextDescriptor.php
@@ -117,7 +117,7 @@ protected function describeInputDefinition(InputDefinition $definition, array $o
 
             $this->writeText('<comment>Options:</comment>', $options);
             foreach ($definition->getOptions() as $option) {
-                if (\strlen($option->getShortcut()) > 1) {
+                if (\strlen($option->getShortcut() ?? '') > 1) {
                     $laterOptions[] = $option;
                     continue;
                 }
diff --git a/Descriptor/XmlDescriptor.php b/Descriptor/XmlDescriptor.php
index 4931fba62..5323a3ba8 100644
--- a/Descriptor/XmlDescriptor.php
+++ b/Descriptor/XmlDescriptor.php
@@ -200,7 +200,7 @@ private function getInputOptionDocument(InputOption $option): \DOMDocument
 
         $dom->appendChild($objectXML = $dom->createElement('option'));
         $objectXML->setAttribute('name', '--'.$option->getName());
-        $pos = strpos($option->getShortcut(), '|');
+        $pos = strpos($option->getShortcut() ?? '', '|');
         if (false !== $pos) {
             $objectXML->setAttribute('shortcut', '-'.substr($option->getShortcut(), 0, $pos));
             $objectXML->setAttribute('shortcuts', '-'.str_replace('|', '|-', $option->getShortcut()));
diff --git a/Helper/ProgressIndicator.php b/Helper/ProgressIndicator.php
index 491a537eb..2d8774201 100644
--- a/Helper/ProgressIndicator.php
+++ b/Helper/ProgressIndicator.php
@@ -185,7 +185,7 @@ private function display()
             }
 
             return $matches[0];
-        }, $this->format));
+        }, $this->format ?? ''));
     }
 
     private function determineBestFormat(): string
diff --git a/Helper/QuestionHelper.php b/Helper/QuestionHelper.php
index 72880f6a6..340b552aa 100644
--- a/Helper/QuestionHelper.php
+++ b/Helper/QuestionHelper.php
@@ -110,11 +110,6 @@ private function doAsk(OutputInterface $output, Question $question)
         $inputStream = $this->inputStream ?: \STDIN;
         $autocomplete = $question->getAutocompleterCallback();
 
-        if (\function_exists('sapi_windows_cp_set')) {
-            // Codepage used by cmd.exe on Windows to allow special characters (éàüñ).
-            @sapi_windows_cp_set(1252);
-        }
-
         if (null === $autocomplete || !self::$stty || !Terminal::hasSttyAvailable()) {
             $ret = false;
             if ($question->isHidden()) {
@@ -514,7 +509,10 @@ private function isInteractiveInput($inputStream): bool
     private function readInput($inputStream, Question $question)
     {
         if (!$question->isMultiline()) {
-            return fgets($inputStream, 4096);
+            $cp = $this->setIOCodepage();
+            $ret = fgets($inputStream, 4096);
+
+            return $this->resetIOCodepage($cp, $ret);
         }
 
         $multiLineStreamReader = $this->cloneInputStream($inputStream);
@@ -523,6 +521,7 @@ private function readInput($inputStream, Question $question)
         }
 
         $ret = '';
+        $cp = $this->setIOCodepage();
         while (false !== ($char = fgetc($multiLineStreamReader))) {
             if (\PHP_EOL === "{$ret}{$char}") {
                 break;
@@ -530,7 +529,44 @@ private function readInput($inputStream, Question $question)
             $ret .= $char;
         }
 
-        return $ret;
+        return $this->resetIOCodepage($cp, $ret);
+    }
+
+    /**
+     * Sets console I/O to the host code page.
+     *
+     * @return int Previous code page in IBM/EBCDIC format
+     */
+    private function setIOCodepage(): int
+    {
+        if (\function_exists('sapi_windows_cp_set')) {
+            $cp = sapi_windows_cp_get();
+            sapi_windows_cp_set(sapi_windows_cp_get('oem'));
+
+            return $cp;
+        }
+
+        return 0;
+    }
+
+    /**
+     * Sets console I/O to the specified code page and converts the user input.
+     *
+     * @param string|false $input
+     *
+     * @return string|false
+     */
+    private function resetIOCodepage(int $cp, $input)
+    {
+        if (0 !== $cp) {
+            sapi_windows_cp_set($cp);
+
+            if (false !== $input && '' !== $input) {
+                $input = sapi_windows_cp_conv(sapi_windows_cp_get('oem'), $cp, $input);
+            }
+        }
+
+        return $input;
     }
 
     /**
diff --git a/Helper/Table.php b/Helper/Table.php
index ee969bcff..9662f4e75 100644
--- a/Helper/Table.php
+++ b/Helper/Table.php
@@ -572,7 +572,7 @@ private function buildTableRows(array $rows): TableRows
                 if (isset($this->columnMaxWidths[$column]) && Helper::strlenWithoutDecoration($formatter, $cell) > $this->columnMaxWidths[$column]) {
                     $cell = $formatter->formatAndWrap($cell, $this->columnMaxWidths[$column] * $colspan);
                 }
-                if (!strstr($cell, "\n")) {
+                if (!strstr($cell ?? '', "\n")) {
                     continue;
                 }
                 $escaped = implode("\n", array_map([OutputFormatter::class, 'escapeTrailingBackslash'], explode("\n", $cell)));