diff --git a/framework/validators/CaptchaValidator.php b/framework/validators/CaptchaValidator.php
index f35b332..65e7fd3 100644
--- a/framework/validators/CaptchaValidator.php
+++ b/framework/validators/CaptchaValidator.php
@@ -53,7 +53,7 @@ class CaptchaValidator extends Validator
 	public function validateValue($value)
 	{
 		$captcha = $this->getCaptchaAction();
-		return $captcha->validate($value, $this->caseSensitive);
+		return !is_array($value) && $captcha->validate($value, $this->caseSensitive);
 	}
 
 	/**
diff --git a/framework/validators/ExistValidator.php b/framework/validators/ExistValidator.php
index b39be56..ec01134 100644
--- a/framework/validators/ExistValidator.php
+++ b/framework/validators/ExistValidator.php
@@ -48,6 +48,11 @@ class ExistValidator extends Validator
 	{
 		$value = $object->$attribute;
 
+		if (is_array($value)) {
+			$this->addError($object, $attribute, Yii::t('yii|{attribute} is invalid.'));
+			return;
+		}
+
 		/** @var $className \yii\db\ActiveRecord */
 		$className = $this->className === null ? get_class($object) : Yii::import($this->className);
 		$attributeName = $this->attributeName === null ? $attribute : $this->attributeName;
@@ -67,6 +72,9 @@ class ExistValidator extends Validator
 	 */
 	public function validateValue($value)
 	{
+		if (is_array($value)) {
+			return false;
+		}
 		if ($this->className === null) {
 			throw new InvalidConfigException('The "className" property must be set.');
 		}
diff --git a/framework/validators/NumberValidator.php b/framework/validators/NumberValidator.php
index 6219bdb..4d7297f 100644
--- a/framework/validators/NumberValidator.php
+++ b/framework/validators/NumberValidator.php
@@ -61,6 +61,10 @@ class NumberValidator extends Validator
 	public function validateAttribute($object, $attribute)
 	{
 		$value = $object->$attribute;
+		if (is_array($value)) {
+			$this->addError($object, $attribute, Yii::t('yii|{attribute} is invalid.'));
+			return;
+		}
 		if ($this->integerOnly) {
 			if (!preg_match($this->integerPattern, "$value")) {
 				$message = $this->message !== null ? $this->message : Yii::t('yii|{attribute} must be an integer.');
diff --git a/framework/validators/RegularExpressionValidator.php b/framework/validators/RegularExpressionValidator.php
index b0811e9..d88f613 100644
--- a/framework/validators/RegularExpressionValidator.php
+++ b/framework/validators/RegularExpressionValidator.php
@@ -51,8 +51,8 @@ class RegularExpressionValidator extends Validator
 	public function validateAttribute($object, $attribute)
 	{
 		$value = $object->$attribute;
-		if ((!$this->not && !preg_match($this->pattern, $value)) || ($this->not && preg_match($this->pattern, $value))) {
-			$message = ($this->message !== null) ? $this->message : \Yii::t('yii|{attribute} is invalid.');
+		if (!$this->validateValue($value)) {
+			$message = $this->message !== null ? $this->message : \Yii::t('yii|{attribute} is invalid.');
 			$this->addError($object, $attribute, $message);
 		}
 	}
@@ -64,8 +64,9 @@ class RegularExpressionValidator extends Validator
 	 */
 	public function validateValue($value)
 	{
-		return !$this->not && preg_match($this->pattern, $value)
-			|| $this->not && !preg_match($this->pattern, $value);
+		return !is_array($value) &&
+			(!$this->not && preg_match($this->pattern, $value)
+			|| $this->not && !preg_match($this->pattern, $value));
 	}
 
 	/**
diff --git a/framework/validators/UniqueValidator.php b/framework/validators/UniqueValidator.php
index 8d5c8b7..30735b1 100644
--- a/framework/validators/UniqueValidator.php
+++ b/framework/validators/UniqueValidator.php
@@ -40,6 +40,12 @@ class UniqueValidator extends Validator
 	public function validateAttribute($object, $attribute)
 	{
 		$value = $object->$attribute;
+
+		if (is_array($value)) {
+			$this->addError($object, $attribute, Yii::t('yii|{attribute} is invalid.'));
+			return;
+		}
+
 		/** @var $className \yii\db\ActiveRecord */
 		$className = $this->className === null ? get_class($object) : \Yii::import($this->className);
 		$attributeName = $this->attributeName === null ? $attribute : $this->attributeName;
diff --git a/framework/validators/Validator.php b/framework/validators/Validator.php
index 4dc58ae..b75f86e 100644
--- a/framework/validators/Validator.php
+++ b/framework/validators/Validator.php
@@ -192,7 +192,7 @@ abstract class Validator extends Component
 	 */
 	public function validateValue($value)
 	{
-		throw new NotSupportedException(__CLASS__ . ' does not support validateValue().');
+		throw new NotSupportedException(get_class($this) . ' does not support validateValue().');
 	}
 
 	/**