diff --git a/composer.json b/composer.json
index 7b5456d..cea1d8c 100644
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,8 @@
   },
   "require-dev": {
     "phpunit/phpunit": "^8.0 || ^9.0 || ^10.0 || ^11.0",
-    "phpstan/phpstan": "^1"
+    "phpstan/phpstan": "^1",
+    "phpstan/phpstan-strict-rules": "^1.6"
 
   },
   "autoload": {
diff --git a/phpstan.neon b/phpstan.neon
index 2c1409d..4ed7226 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,8 +1,11 @@
 includes:
 	- phpstan-baseline.neon
+	- vendor/phpstan/phpstan-strict-rules/rules.neon
 parameters:
     level: 8
     paths:
         - src
     bootstrapFiles:
         - stan_autoload.php
+    treatPhpDocTypesAsCertain: false
+    reportMaybesInPropertyPhpDocTypes: false
diff --git a/src/QueryBuilderForm.php b/src/QueryBuilderForm.php
index e8da1d2..18a6c7a 100644
--- a/src/QueryBuilderForm.php
+++ b/src/QueryBuilderForm.php
@@ -70,7 +70,7 @@ class QueryBuilderForm extends Widget
     public $rulesParam = 'rules';
 
     /**
-     * @var array<mixed>|QueryBuilder QueryBuilder column configuration.
+     * @var array<mixed>|QueryBuilder $builder QueryBuilder column configuration.
      * For example,
      *
      * ```php
@@ -91,7 +91,7 @@ class QueryBuilderForm extends Widget
     /**
      * @var string JSON rules representation into array format
      */
-    public $rules;
+    public string $rules = '';
 
     /**
      * @inheritdoc
@@ -106,7 +106,7 @@ public function init() : void
             $this->builder = $builder;
         }
 
-        if (!$this->builder instanceof QueryBuilder) {
+        if (!($this->builder instanceof QueryBuilder)) {
             throw new InvalidConfigException('The "builder" property must be instance of "QueryBuilder');
         }
 
@@ -134,7 +134,7 @@ public function run()
         $builderId = $this->builder->getId();
         $view = $this->getView();
 
-        if ($this->rules) {
+        if (strlen($this->rules) > 0) {
             $rules = Json::encode($this->rules);
             $view->registerJs("$('#{$builderId}').queryBuilder('setRules', {$rules});");
         }
diff --git a/src/RuleHelper.php b/src/RuleHelper.php
index ecf5844..4c1d409 100644
--- a/src/RuleHelper.php
+++ b/src/RuleHelper.php
@@ -13,7 +13,7 @@ class RuleHelper
      */
     public static function addPrefixToRules(array $rules, string $prefix) : array
     {
-        if (!isset($rules['rules']) || !$rules['rules']) {
+        if (!array_key_exists('rules', $rules) || !is_array($rules['rules']) || count($rules['rules']) === 0 ) {
             return $rules;
         }
 
@@ -33,7 +33,4 @@ public static function addPrefixToRules(array $rules, string $prefix) : array
 
     }
 
-
-
-
 }
\ No newline at end of file
diff --git a/src/Translator.php b/src/Translator.php
index 2db1181..2e3802a 100644
--- a/src/Translator.php
+++ b/src/Translator.php
@@ -54,7 +54,7 @@ class Translator
     public function __construct(private readonly array $data, ?string $paramPrefix = null)
     {
         $this->init();
-        if($paramPrefix){
+        if(!is_null($paramPrefix)){
             $this->paramPrefix = $paramPrefix;
         }
         $this->_where = $this->buildWhere($this->data);
@@ -75,11 +75,11 @@ protected function encodeRule(string $field, string $type, array $params): strin
         $keys = array_keys($params);
 
         if (is_string($pattern)) {
-            $replacement = !empty($keys) ? $keys[0] : null;
+            $replacement = count($keys)>0 ? $keys[0] : null;
         } else {
             $op = ArrayHelper::getValue($pattern, 'op');
             $list = ArrayHelper::getValue($pattern, 'list');
-            if ($list){
+            if (!is_null($list)){
                 $sep = ArrayHelper::getValue($pattern, 'sep');
                 $replacement = implode($sep, $keys);
             } else {
@@ -91,7 +91,7 @@ protected function encodeRule(string $field, string $type, array $params): strin
         }
 
         $this->_params = array_merge($this->_params, $params);
-        return $field . " " . ($replacement ? str_replace("?", $replacement, $pattern) : $pattern);
+        return $field . " " . (is_null($replacement) ? $pattern : str_replace("?", $replacement, $pattern) );
     }
 
     /**
@@ -100,7 +100,7 @@ protected function encodeRule(string $field, string $type, array $params): strin
      */
     protected function buildWhere(array $data) : string
     {
-        if (!isset($data['rules']) || !$data['rules']) {
+        if (!array_key_exists('rules', $data) || !is_array($data['rules']) || count($data['rules']) === 0 ) {
             return '';
         }