diff --git a/composer.json b/composer.json
index 1a51e9a6..0dafd6e8 100644
--- a/composer.json
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diff --git a/composer.lock b/composer.lock
index 702a08d5..a913431b 100644
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         {
             "name": "phpunit/php-invoker",
@@ -3630,16 +3700,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "9.5.10",
+            "version": "9.5.11",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "c814a05837f2edb0d1471d6e3f4ab3501ca3899a"
+                "reference": "2406855036db1102126125537adb1406f7242fdd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/c814a05837f2edb0d1471d6e3f4ab3501ca3899a",
-                "reference": "c814a05837f2edb0d1471d6e3f4ab3501ca3899a",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/2406855036db1102126125537adb1406f7242fdd",
+                "reference": "2406855036db1102126125537adb1406f7242fdd",
                 "shasum": ""
             },
             "require": {
@@ -3717,11 +3787,11 @@
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.10"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.11"
             },
             "funding": [
                 {
-                    "url": "https://phpunit.de/donate.html",
+                    "url": "https://phpunit.de/sponsors.html",
                     "type": "custom"
                 },
                 {
@@ -3729,7 +3799,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-09-25T07:38:51+00:00"
+            "time": "2021-12-25T07:07:57+00:00"
         },
         {
             "name": "psalm/plugin-mockery",
@@ -4418,16 +4488,16 @@
         },
         {
             "name": "sebastian/exporter",
-            "version": "4.0.3",
+            "version": "4.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/exporter.git",
-                "reference": "d89cc98761b8cb5a1a235a6b703ae50d34080e65"
+                "reference": "65e8b7db476c5dd267e65eea9cab77584d3cfff9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/d89cc98761b8cb5a1a235a6b703ae50d34080e65",
-                "reference": "d89cc98761b8cb5a1a235a6b703ae50d34080e65",
+                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/65e8b7db476c5dd267e65eea9cab77584d3cfff9",
+                "reference": "65e8b7db476c5dd267e65eea9cab77584d3cfff9",
                 "shasum": ""
             },
             "require": {
@@ -4476,14 +4546,14 @@
                 }
             ],
             "description": "Provides the functionality to export PHP variables for visualization",
-            "homepage": "http://www.github.com/sebastianbergmann/exporter",
+            "homepage": "https://www.github.com/sebastianbergmann/exporter",
             "keywords": [
                 "export",
                 "exporter"
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/exporter/issues",
-                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.3"
+                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.4"
             },
             "funding": [
                 {
@@ -4491,7 +4561,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-09-28T05:24:23+00:00"
+            "time": "2021-11-11T14:18:36+00:00"
         },
         {
             "name": "sebastian/global-state",
@@ -4955,16 +5025,16 @@
         },
         {
             "name": "squizlabs/php_codesniffer",
-            "version": "3.6.1",
+            "version": "3.6.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "f268ca40d54617c6e06757f83f699775c9b3ff2e"
+                "reference": "5e4e71592f69da17871dba6e80dd51bce74a351a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/f268ca40d54617c6e06757f83f699775c9b3ff2e",
-                "reference": "f268ca40d54617c6e06757f83f699775c9b3ff2e",
+                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/5e4e71592f69da17871dba6e80dd51bce74a351a",
+                "reference": "5e4e71592f69da17871dba6e80dd51bce74a351a",
                 "shasum": ""
             },
             "require": {
@@ -5007,7 +5077,7 @@
                 "source": "https://github.com/squizlabs/PHP_CodeSniffer",
                 "wiki": "https://github.com/squizlabs/PHP_CodeSniffer/wiki"
             },
-            "time": "2021-10-11T04:00:11+00:00"
+            "time": "2021-12-12T21:44:58+00:00"
         },
         {
             "name": "symfony/config",
@@ -5293,16 +5363,16 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v6.0.0",
+            "version": "v6.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "f3064a2e0b5eabaeaf92db0a5913a77098b3b91e"
+                "reference": "d34390fe7e8c0fe7e4192c67c27ecf58bc7d3ed7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/f3064a2e0b5eabaeaf92db0a5913a77098b3b91e",
-                "reference": "f3064a2e0b5eabaeaf92db0a5913a77098b3b91e",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/d34390fe7e8c0fe7e4192c67c27ecf58bc7d3ed7",
+                "reference": "d34390fe7e8c0fe7e4192c67c27ecf58bc7d3ed7",
                 "shasum": ""
             },
             "require": {
@@ -5347,7 +5417,7 @@
             "description": "Loads and dumps YAML files",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/yaml/tree/v6.0.0"
+                "source": "https://github.com/symfony/yaml/tree/v6.0.1"
             },
             "funding": [
                 {
@@ -5363,7 +5433,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-11-28T15:34:37+00:00"
+            "time": "2021-12-08T15:13:44+00:00"
         },
         {
             "name": "theseer/tokenizer",
@@ -5417,16 +5487,16 @@
         },
         {
             "name": "vimeo/psalm",
-            "version": "v4.14.0",
+            "version": "v4.15.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/vimeo/psalm.git",
-                "reference": "14dcbc908ab2625cd7a74258ee6c740cbecc6140"
+                "reference": "a1b5e489e6fcebe40cb804793d964e99fc347820"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/vimeo/psalm/zipball/14dcbc908ab2625cd7a74258ee6c740cbecc6140",
-                "reference": "14dcbc908ab2625cd7a74258ee6c740cbecc6140",
+                "url": "https://api.github.com/repos/vimeo/psalm/zipball/a1b5e489e6fcebe40cb804793d964e99fc347820",
+                "reference": "a1b5e489e6fcebe40cb804793d964e99fc347820",
                 "shasum": ""
             },
             "require": {
@@ -5517,9 +5587,9 @@
             ],
             "support": {
                 "issues": "https://github.com/vimeo/psalm/issues",
-                "source": "https://github.com/vimeo/psalm/tree/v4.14.0"
+                "source": "https://github.com/vimeo/psalm/tree/v4.15.0"
             },
-            "time": "2021-12-04T17:49:24+00:00"
+            "time": "2021-12-07T11:25:29+00:00"
         },
         {
             "name": "webmozart/assert",
@@ -5646,5 +5716,5 @@
     "platform-dev": {
         "ext-posix": "*"
     },
-    "plugin-api-version": "2.1.0"
+    "plugin-api-version": "2.2.0"
 }
diff --git a/src/Lib/Elf/Parser/ElfParserException.php b/src/Lib/Elf/Parser/ElfParserException.php
index 0e81b38b..f1e578fd 100644
--- a/src/Lib/Elf/Parser/ElfParserException.php
+++ b/src/Lib/Elf/Parser/ElfParserException.php
@@ -15,5 +15,4 @@
 
 final class ElfParserException extends \Exception
 {
-
 }
diff --git a/src/Lib/Elf/Process/ProcessSymbolReaderException.php b/src/Lib/Elf/Process/ProcessSymbolReaderException.php
index 57621220..c5bb2223 100644
--- a/src/Lib/Elf/Process/ProcessSymbolReaderException.php
+++ b/src/Lib/Elf/Process/ProcessSymbolReaderException.php
@@ -15,5 +15,4 @@
 
 class ProcessSymbolReaderException extends \Exception
 {
-
 }
diff --git a/src/Lib/FFI/CannotAllocateBufferException.php b/src/Lib/FFI/CannotAllocateBufferException.php
new file mode 100644
index 00000000..4aa684c4
--- /dev/null
+++ b/src/Lib/FFI/CannotAllocateBufferException.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * This file is part of the sj-i/php-profiler package.
+ *
+ * (c) sji <sji@sj-i.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace PhpProfiler\Lib\FFI;
+
+final class CannotAllocateBufferException extends \Exception
+{
+}
diff --git a/src/Lib/FFI/CannotCastCDataException.php b/src/Lib/FFI/CannotCastCDataException.php
new file mode 100644
index 00000000..19d9125c
--- /dev/null
+++ b/src/Lib/FFI/CannotCastCDataException.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * This file is part of the sj-i/php-profiler package.
+ *
+ * (c) sji <sji@sj-i.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace PhpProfiler\Lib\FFI;
+
+final class CannotCastCDataException extends \Exception
+{
+}
diff --git a/src/Lib/FFI/CannotGetTypeForCDataException.php b/src/Lib/FFI/CannotGetTypeForCDataException.php
new file mode 100644
index 00000000..2bc7b5db
--- /dev/null
+++ b/src/Lib/FFI/CannotGetTypeForCDataException.php
@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * This file is part of the sj-i/php-profiler package.
+ *
+ * (c) sji <sji@sj-i.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace PhpProfiler\Lib\FFI;
+
+use Throwable;
+
+final class CannotGetTypeForCDataException extends \Exception
+{
+    public function __construct(
+        string $message = "",
+        int $code = 0,
+        ?Throwable $previous = null,
+        public string $type = '',
+    ) {
+        parent::__construct($message, $code, $previous);
+    }
+}
diff --git a/src/Lib/FFI/CannotLoadCHeaderException.php b/src/Lib/FFI/CannotLoadCHeaderException.php
new file mode 100644
index 00000000..d772e014
--- /dev/null
+++ b/src/Lib/FFI/CannotLoadCHeaderException.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * This file is part of the sj-i/php-profiler package.
+ *
+ * (c) sji <sji@sj-i.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace PhpProfiler\Lib\FFI;
+
+final class CannotLoadCHeaderException extends \Exception
+{
+}
diff --git a/src/Lib/File/NativeFileReader.php b/src/Lib/File/NativeFileReader.php
index d2885aff..aa91a20e 100644
--- a/src/Lib/File/NativeFileReader.php
+++ b/src/Lib/File/NativeFileReader.php
@@ -14,6 +14,7 @@
 namespace PhpProfiler\Lib\File;
 
 use FFI;
+use PhpProfiler\Lib\FFI\CannotAllocateBufferException;
 
 class NativeFileReader implements FileReaderInterface
 {
@@ -32,7 +33,8 @@ public function __construct()
 
     public function readAll(string $path): string
     {
-        $buffer = $this->ffi->new("unsigned char[4096]");
+        $buffer = $this->ffi->new("unsigned char[4096]")
+            ?? throw new CannotAllocateBufferException('cannot allocate buffer');
 
         $fd = $this->ffi->open($path, 0);
         $result = "";
diff --git a/src/Lib/Libc/Sys/Ptrace/PtraceX64.php b/src/Lib/Libc/Sys/Ptrace/PtraceX64.php
index 4e63847c..fc9b856f 100644
--- a/src/Lib/Libc/Sys/Ptrace/PtraceX64.php
+++ b/src/Lib/Libc/Sys/Ptrace/PtraceX64.php
@@ -15,6 +15,8 @@
 
 use FFI\CData;
 use FFI\CInteger;
+use PhpProfiler\Lib\FFI\CannotAllocateBufferException;
+use PhpProfiler\Lib\FFI\CannotCastCDataException;
 use PhpProfiler\Lib\Libc\Addressable;
 
 class PtraceX64 implements Ptrace
@@ -95,15 +97,19 @@ public function ptrace(
     ): int {
         if (is_null($addr) or is_int($addr)) {
             /** @var CInteger */
-            $addr_holder = \FFI::new('long');
+            $addr_holder = \FFI::new('long')
+                ?? throw new CannotAllocateBufferException('cannot allocate buffer');
             $addr_holder->cdata = (int)$addr;
-            $addr = \FFI::cast('void *', $addr_holder);
+            $addr = \FFI::cast('void *', $addr_holder)
+                ?? throw new CannotCastCDataException('cannot cast buffer');
         }
         if (is_null($data) or is_int($data)) {
             /** @var CInteger */
-            $data_holder = \FFI::new('long');
+            $data_holder = \FFI::new('long')
+                ?? throw new CannotAllocateBufferException('cannot allocate buffer');
             $data_holder->cdata = (int)$data;
-            $data = \FFI::cast('void *', $data_holder);
+            $data = \FFI::cast('void *', $data_holder)
+                ?? throw new CannotCastCDataException('cannot cast buffer');
         }
 
         $addr_pointer = $addr instanceof Addressable ? $addr->toVoidPointer() : $addr;
diff --git a/src/Lib/PhpInternals/ZendTypeReader.php b/src/Lib/PhpInternals/ZendTypeReader.php
index b4eb30fa..507854df 100644
--- a/src/Lib/PhpInternals/ZendTypeReader.php
+++ b/src/Lib/PhpInternals/ZendTypeReader.php
@@ -15,6 +15,8 @@
 
 use FFI;
 use FFI\CData;
+use PhpProfiler\Lib\FFI\CannotGetTypeForCDataException;
+use PhpProfiler\Lib\FFI\CannotLoadCHeaderException;
 
 final class ZendTypeReader
 {
@@ -52,7 +54,8 @@ private function loadHeader(string $php_version): FFI
             if ($php_version === self::V81) {
                 $php_version = self::V80;
             }
-            $this->ffi = FFI::load(__DIR__ . "/Headers/{$php_version}.h");
+            $this->ffi = FFI::load(__DIR__ . "/Headers/{$php_version}.h")
+                ?? throw new CannotLoadCHeaderException('cannot load headers for zend engine');
         }
         return $this->ffi;
     }
@@ -66,7 +69,11 @@ public function readAs(string $type, CData $cdata): ZendTypeCData
     public function sizeOf(string $type): int
     {
         $ffi = $this->loadHeader($this->php_version);
-        $type = $ffi->type($type);
-        return FFI::sizeof($type);
+        $cdata_type = $ffi->type($type)
+            ?? throw new CannotGetTypeForCDataException(
+                message: 'cannot get type for a C Data',
+                type: $type
+            );
+        return FFI::sizeof($cdata_type);
     }
 }
diff --git a/src/Lib/Process/MemoryReader/MemoryReader.php b/src/Lib/Process/MemoryReader/MemoryReader.php
index ba4801b7..e60348b1 100644
--- a/src/Lib/Process/MemoryReader/MemoryReader.php
+++ b/src/Lib/Process/MemoryReader/MemoryReader.php
@@ -15,6 +15,7 @@
 
 use FFI;
 use FFI\CData;
+use PhpProfiler\Lib\FFI\CannotAllocateBufferException;
 
 final class MemoryReader implements MemoryReaderInterface
 {
@@ -39,9 +40,12 @@ public function __construct()
                          unsigned long riovcnt,
                          unsigned long flags);
        ', 'libc.so.6');
-        $this->local_iov = $this->ffi->new('struct iovec');
-        $this->remote_iov = $this->ffi->new('struct iovec');
-        $this->remote_base = $this->ffi->new('long');
+        $this->local_iov = $this->ffi->new('struct iovec')
+            ?? throw new CannotAllocateBufferException('cannot allocate buffer');
+        $this->remote_iov = $this->ffi->new('struct iovec')
+            ?? throw new CannotAllocateBufferException('cannot allocate buffer');
+        $this->remote_base = $this->ffi->new('long')
+            ?? throw new CannotAllocateBufferException('cannot allocate buffer');
     }
 
     /**
@@ -50,7 +54,8 @@ public function __construct()
      */
     public function read(int $pid, int $remote_address, int $size): CData
     {
-        $buffer = $this->ffi->new("unsigned char[{$size}]");
+        $buffer = $this->ffi->new("unsigned char[{$size}]")
+            ?? throw new CannotAllocateBufferException('cannot allocate buffer');
 
         /**
          * @var FFI\Libc\iovec $this->local_iov
diff --git a/tests/Command/CommandEnumeratorTestData/Test1Directory/Test1Command.php b/tests/Command/CommandEnumeratorTestData/Test1Directory/Test1Command.php
index 4b1ff864..f85df8c7 100644
--- a/tests/Command/CommandEnumeratorTestData/Test1Directory/Test1Command.php
+++ b/tests/Command/CommandEnumeratorTestData/Test1Directory/Test1Command.php
@@ -15,5 +15,4 @@
 
 final class Test1Command
 {
-
 }
diff --git a/tests/Command/CommandEnumeratorTestData/Test1Directory/Test2Command.php b/tests/Command/CommandEnumeratorTestData/Test1Directory/Test2Command.php
index 71e45fff..cc5076ed 100644
--- a/tests/Command/CommandEnumeratorTestData/Test1Directory/Test2Command.php
+++ b/tests/Command/CommandEnumeratorTestData/Test1Directory/Test2Command.php
@@ -15,5 +15,4 @@
 
 final class Test2Command
 {
-
 }
diff --git a/tests/Command/CommandEnumeratorTestData/Test2Directory/Test3Command.php b/tests/Command/CommandEnumeratorTestData/Test2Directory/Test3Command.php
index 7bc1067a..4611a738 100644
--- a/tests/Command/CommandEnumeratorTestData/Test2Directory/Test3Command.php
+++ b/tests/Command/CommandEnumeratorTestData/Test2Directory/Test3Command.php
@@ -15,5 +15,4 @@
 
 final class Test3Command
 {
-
 }
diff --git a/tests/Command/CommandEnumeratorTestData/Test2Directory/Test4Command.php b/tests/Command/CommandEnumeratorTestData/Test2Directory/Test4Command.php
index b67212dc..2fa2062f 100644
--- a/tests/Command/CommandEnumeratorTestData/Test2Directory/Test4Command.php
+++ b/tests/Command/CommandEnumeratorTestData/Test2Directory/Test4Command.php
@@ -15,5 +15,4 @@
 
 final class Test4Command
 {
-
 }
diff --git a/tests/Inspector/Daemon/Searcher/Context/PhpSearcherContextCreatorTest.php b/tests/Inspector/Daemon/Searcher/Context/PhpSearcherContextCreatorTest.php
index 98dde230..31325992 100644
--- a/tests/Inspector/Daemon/Searcher/Context/PhpSearcherContextCreatorTest.php
+++ b/tests/Inspector/Daemon/Searcher/Context/PhpSearcherContextCreatorTest.php
@@ -24,7 +24,6 @@
 
 class PhpSearcherContextCreatorTest extends TestCase
 {
-
     public function testCreate()
     {
         $context = Mockery::mock(ContextInterface::class);
diff --git a/tests/Lib/ByteStream/ByteReaderDisableWriteAccessTraitTest.php b/tests/Lib/ByteStream/ByteReaderDisableWriteAccessTraitTest.php
index 21e571c6..2fdd0ef2 100644
--- a/tests/Lib/ByteStream/ByteReaderDisableWriteAccessTraitTest.php
+++ b/tests/Lib/ByteStream/ByteReaderDisableWriteAccessTraitTest.php
@@ -19,7 +19,6 @@
 
 class ByteReaderDisableWriteAccessTraitTest extends TestCase
 {
-
     public function testOffsetSet()
     {
         $this->expectException(LogicException::class);
diff --git a/tests/Lib/Elf/SymbolResolver/Elf64DynamicSymbolResolverTest.php b/tests/Lib/Elf/SymbolResolver/Elf64DynamicSymbolResolverTest.php
index e0217c7f..d79a46f0 100644
--- a/tests/Lib/Elf/SymbolResolver/Elf64DynamicSymbolResolverTest.php
+++ b/tests/Lib/Elf/SymbolResolver/Elf64DynamicSymbolResolverTest.php
@@ -21,7 +21,6 @@
 
 class Elf64DynamicSymbolResolverTest extends TestCase
 {
-
     public function testLoad()
     {
         $php_binary = new StringByteReader(