diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6c33240..b770e76 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -105,4 +105,4 @@ jobs:
         run: "./tools/composer update --no-ansi --no-interaction --no-progress"
 
       - name: "Run mutation tests with Infection"
-        run: "./tools/infection"
+        run: "./tools/infection --only-covered"
diff --git a/.psalm/baseline.xml b/.psalm/baseline.xml
index 2a811d0..68fc820 100644
--- a/.psalm/baseline.xml
+++ b/.psalm/baseline.xml
@@ -1,2 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="5.8.0@9cf4f60a333f779ad3bc704a555920e81d4fdcda"/>
+<files psalm-version="5.8.0@9cf4f60a333f779ad3bc704a555920e81d4fdcda">
+  <file src="src/Parser.php">
+    <ArgumentTypeCoercion>
+      <code>$line</code>
+    </ArgumentTypeCoercion>
+  </file>
+</files>
diff --git a/src/Parser.php b/src/Parser.php
index c19a41a..235fea0 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -9,10 +9,10 @@
  */
 namespace SebastianBergmann\CsvParser;
 
-use function array_shift;
-use function file;
-use function str_getcsv;
+use function is_array;
 use Generator;
+use RuntimeException;
+use SplFileObject;
 
 /**
  * @no-named-arguments Parameter names are not covered by the backward compatibility promise for this library
@@ -27,31 +27,39 @@ final class Parser
      */
     public function parse(string $filename, Schema $schema, bool $ignoreFirstLine = true): Generator
     {
-        $lines = @file($filename);
-
-        if ($lines === false) {
-            throw CannotReadCsvFileException::from($filename);
+        try {
+            $file = new SplFileObject($filename);
+        } catch (RuntimeException $e) {
+            throw new CannotReadCsvFileException($e->getMessage());
         }
 
-        if ($ignoreFirstLine) {
-            array_shift($lines);
-        }
+        $file->setFlags(SplFileObject::READ_CSV | SplFileObject::SKIP_EMPTY | SplFileObject::DROP_NEW_LINE);
 
-        return $this->generator($lines, $schema);
+        return $this->generator($file, $schema, $ignoreFirstLine);
     }
 
     /**
-     * @psalm-param list<string> $lines
-     *
      * @psalm-return Generator<int, array<string, int|float|string>>
      */
-    private function generator(array $lines, Schema $schema): Generator
+    private function generator(SplFileObject $file, Schema $schema, bool $ignoreFirstLine): Generator
     {
-        foreach ($lines as $line) {
+        $firstLine = true;
+
+        foreach ($file as $line) {
+            if ($ignoreFirstLine && $firstLine) {
+                $firstLine = false;
+
+                continue;
+            }
+
+            if (!is_array($line)) {
+                continue;
+            }
+
             $data = [];
 
             foreach ($schema->columnDefinitions() as $columnDefinition) {
-                $columnDefinition->parse(str_getcsv($line), $data);
+                $columnDefinition->parse($line, $data);
             }
 
             yield $data;
diff --git a/src/exception/CannotReadCsvFileException.php b/src/exception/CannotReadCsvFileException.php
index c2e9074..d7975ad 100644
--- a/src/exception/CannotReadCsvFileException.php
+++ b/src/exception/CannotReadCsvFileException.php
@@ -9,18 +9,8 @@
  */
 namespace SebastianBergmann\CsvParser;
 
-use function sprintf;
 use RuntimeException;
 
 final class CannotReadCsvFileException extends RuntimeException implements Exception
 {
-    public static function from(string $filename): self
-    {
-        return new self(
-            sprintf(
-                'Reading from CSV file %s failed',
-                $filename
-            )
-        );
-    }
 }
diff --git a/src/exception/InvalidValueException.php b/src/exception/InvalidValueException.php
deleted file mode 100644
index 7f261c0..0000000
--- a/src/exception/InvalidValueException.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php declare(strict_types=1);
-/*
- * This file is part of sebastian/csv-parser.
- *
- * (c) Sebastian Bergmann <sebastian@phpunit.de>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-namespace SebastianBergmann\CsvParser;
-
-use RuntimeException;
-
-final class InvalidValueException extends RuntimeException implements Exception
-{
-}
diff --git a/src/schema/ColumnDefinition.php b/src/schema/ColumnDefinition.php
index e1397d9..466e496 100644
--- a/src/schema/ColumnDefinition.php
+++ b/src/schema/ColumnDefinition.php
@@ -50,7 +50,7 @@ private function __construct(int $position, string $name, Type $type)
     }
 
     /**
-     * @psalm-param list<?string> $input
+     * @psalm-param list<string> $input
      * @psalm-param array<string, mixed> $output
      *
      * @throws OutOfBoundsException
@@ -65,10 +65,6 @@ public function parse(array $input, array &$output): void
 
         $value = $input[$this->position - 1];
 
-        if ($value === null) {
-            throw new InvalidValueException('Input array has element with invalid value at position ' . $this->position);
-        }
-
         $output[$this->name] = $this->type->cast($value);
     }
 
diff --git a/tests/unit/ParserTest.php b/tests/unit/ParserTest.php
index e863a3b..0fb44f1 100644
--- a/tests/unit/ParserTest.php
+++ b/tests/unit/ParserTest.php
@@ -17,7 +17,6 @@
 use PHPUnit\Framework\TestCase;
 
 #[CoversClass(Parser::class)]
-#[CoversClass(CannotReadCsvFileException::class)]
 #[UsesClass(Schema::class)]
 #[UsesClass(ColumnDefinition::class)]
 #[UsesClass(Type::class)]
@@ -88,7 +87,6 @@ public function test_Parses_CSV_file_according_to_schema(array $expected, Schema
     public function test_Cannot_read_from_CSV_file_that_does_not_exist(): void
     {
         $this->expectException(CannotReadCsvFileException::class);
-        $this->expectExceptionMessage('Reading from CSV file does_not_exist.csv failed');
 
         (new Parser)->parse('does_not_exist.csv', Schema::from([]));
     }
diff --git a/tests/unit/schema/ColumnDefinitionTest.php b/tests/unit/schema/ColumnDefinitionTest.php
index 5c071c9..d627cf7 100644
--- a/tests/unit/schema/ColumnDefinitionTest.php
+++ b/tests/unit/schema/ColumnDefinitionTest.php
@@ -56,17 +56,6 @@ public function testCannotParseColumnFromInputArrayThatDoesNotExist(): void
         $this->column()->parse($input, $output);
     }
 
-    public function testCannotParseColumnWithInvalidValue(): void
-    {
-        $input  = [null];
-        $output = [];
-
-        $this->expectException(InvalidValueException::class);
-        $this->expectExceptionMessage('Input array has element with invalid value at position 1');
-
-        $this->column()->parse($input, $output);
-    }
-
     private function column(): ColumnDefinition
     {
         return ColumnDefinition::from(1, 'name', Type::integer());