diff --git a/composer.json b/composer.json
index 2a777a15..26c633a0 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,7 @@
     "require": {
         "php": "^8.0",
         "ext-json": "*",
+        "ext-mbstring": "*",
         "ext-pdo": "*",
         "codeception/codeception": "*@dev"
     },
diff --git a/src/Codeception/Lib/Driver/Db.php b/src/Codeception/Lib/Driver/Db.php
index b5680459..e83df570 100755
--- a/src/Codeception/Lib/Driver/Db.php
+++ b/src/Codeception/Lib/Driver/Db.php
@@ -290,11 +290,13 @@ public function executeQuery($query, array $params): PDOStatement
         $i = 0;
         foreach ($params as $param) {
             ++$i;
-            if (is_bool($param)) {
+            if (is_null($param)) {
+                $type = PDO::PARAM_NULL;
+            } elseif (is_bool($param)) {
                 $type = PDO::PARAM_BOOL;
             } elseif (is_int($param)) {
                 $type = PDO::PARAM_INT;
-            } elseif ($this->isBinary($param)) {
+            } elseif (is_string($param) && $this->isBinary($param)) {
                 $type = PDO::PARAM_LOB;
             } else {
                 $type = PDO::PARAM_STR;
diff --git a/tests/unit/Codeception/Module/Db/AbstractDbTest.php b/tests/unit/Codeception/Module/Db/AbstractDbTest.php
index f880866b..9bd1e4b2 100644
--- a/tests/unit/Codeception/Module/Db/AbstractDbTest.php
+++ b/tests/unit/Codeception/Module/Db/AbstractDbTest.php
@@ -69,6 +69,11 @@ public function testSeeInDatabaseWithBinary()
         $this->module->seeInDatabase('users', ['uuid' => hex2bin('11edc34b01d972fa9c1d0242ac120006')]);
     }
 
+    public function testSeeInDatabaseWithNull()
+    {
+        $this->module->seeInDatabase('users', ['uuid' => null]);
+    }
+
     public function testSeeInDatabase()
     {
         $this->module->seeInDatabase('users', ['name' => 'davert']);