diff --git a/src/Client/Query.php b/src/Client/Query.php
index ebf7d17..e3a095f 100644
--- a/src/Client/Query.php
+++ b/src/Client/Query.php
@@ -5,6 +5,7 @@
 use OramaCloud\Client\QueryParams\SortBy;
 use OramaCloud\Client\QueryParams\SortByOrder;
 use OramaCloud\Client\QueryParams\Where;
+use OramaCloud\Exceptions\QueryException;
 
 class Query
 {
@@ -17,12 +18,15 @@ class Query
 
     public function __construct($term = '', $mode = 'fulltext')
     {
-        $this->term = $term;
-        $this->mode = $mode;
+        $this->term($term)->mode($mode);
     }
 
     public function term(string $term)
     {
+        if (!is_string($term)) {
+            throw new QueryException('Invalid search term.');
+        }
+
         $this->term = $term;
         return $this;
     }
diff --git a/src/Client/QueryParams/SortBy.php b/src/Client/QueryParams/SortBy.php
index f3a2d0c..dde7d14 100644
--- a/src/Client/QueryParams/SortBy.php
+++ b/src/Client/QueryParams/SortBy.php
@@ -2,6 +2,8 @@
 
 namespace OramaCloud\Client\QueryParams;
 
+use OramaCloud\Exceptions\QueryException;
+
 class SortBy
 {
     private $property;
@@ -30,7 +32,7 @@ public function toArray()
     private function validate()
     {
         if (!in_array($this->order, $this->availableOrders)) {
-            throw new \InvalidArgumentException('Invalid $order parameter in SortBy');
+            throw new QueryException('Invalid $order parameter in SortBy');
         }
     }
 }
diff --git a/src/Client/QueryParams/Where.php b/src/Client/QueryParams/Where.php
index 9dcd735..e7a35b1 100644
--- a/src/Client/QueryParams/Where.php
+++ b/src/Client/QueryParams/Where.php
@@ -2,6 +2,8 @@
 
 namespace OramaCloud\Client\QueryParams;
 
+use OramaCloud\Exceptions\QueryException;
+
 class Where
 {
     private $property;
@@ -38,8 +40,12 @@ public function toArray()
 
     private function validate()
     {
+        if (empty($this->property)) {
+            throw new QueryException("Missing or invalid property: {$this->property}");
+        }
+
         if (!in_array($this->operator, $this->availableOperators)) {
-            throw new \InvalidArgumentException("Invalid operator {$this->operator}");
+            throw new QueryException("Invalid where operator: {$this->operator}");
         }
 
         if (in_array($this->operator, [
@@ -47,7 +53,7 @@ private function validate()
             WhereOperator::IN,
             WhereOperator::NIN
         ]) && !is_array($this->value)) {
-            throw new \InvalidArgumentException('Where $value parameter must be an array');
+            throw new QueryException('Where $value argument must be an array');
         }
     }
 }
diff --git a/src/Exceptions/IndexManagerException.php b/src/Exceptions/IndexManagerException.php
new file mode 100644
index 0000000..0e4a99c
--- /dev/null
+++ b/src/Exceptions/IndexManagerException.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace OramaCloud\Exceptions;
+
+class IndexManagerException extends \Exception
+{
+    public function __construct($message)
+    {
+        parent::__construct($message);
+    }
+}
diff --git a/src/Client/QueryException.php b/src/Exceptions/QueryException.php
similarity index 81%
rename from src/Client/QueryException.php
rename to src/Exceptions/QueryException.php
index fb2fe40..789842b 100644
--- a/src/Client/QueryException.php
+++ b/src/Exceptions/QueryException.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace OramaCloud\Client;
+namespace OramaCloud\Exceptions;
 
 class QueryException extends \Exception
 {
diff --git a/src/Manager/CloudManager.php b/src/Manager/CloudManager.php
index d305d24..9769b4c 100644
--- a/src/Manager/CloudManager.php
+++ b/src/Manager/CloudManager.php
@@ -3,6 +3,7 @@
 namespace OramaCloud\Manager;
 
 use GuzzleHttp\Client as HttpClient;
+use OramaCloud\Exceptions\IndexManagerException;
 use OramaCloud\Manager\IndexManager;
 
 class CloudManager
@@ -25,23 +26,29 @@ public function setIndexId(string $id): void
     public function callIndexWebhook(string $endpoint, $payload = null)
     {
         if (!$this->indexId) {
-            throw new \Exception('Index ID is not set');
+            throw new IndexManagerException('Index ID is not set');
         }
 
-        $config = [
-            'headers' => [
+        try {
+            $config['headers'] = [
                 'Content-Type' => 'application/json',
                 'Authorization' => 'Bearer ' . $this->apiKey
-            ]
-        ];
+            ];
 
-        if (!is_null($payload)) {
-            $config['body'] = json_encode($payload);
-        }
+            if (!is_null($payload)) {
+                $config['body'] = json_encode($payload);
+            }
+
+            $response = $this->http->request('POST', $this->getEndpoint($endpoint), $config);
 
-        $response = $this->http->request('POST', $this->getEndpoint($endpoint), $config);
+            if ($response->getStatusCode() !== 200 && $response->getStatusCode() !== 201) {
+                throw new IndexManagerException('Error calling webhook: ' . $response->getBody()->getContents());
+            }
 
-        return json_decode($response->getBody()->getContents());
+            return json_decode($response->getBody()->getContents());
+        } catch (\Exception $e) {
+            throw new IndexManagerException($e->getMessage());
+        }
     }
 
     private function getEndpoint(string $endpoint): string
diff --git a/src/Manager/IndexManager.php b/src/Manager/IndexManager.php
index 88d4054..0d26683 100644
--- a/src/Manager/IndexManager.php
+++ b/src/Manager/IndexManager.php
@@ -68,7 +68,7 @@ private function init($manager)
     {
         if ($manager instanceof CloudManager) {
             $this->manager = $manager;
-        } else if ($manager instanceof string) {
+        } else if (gettype($manager) === 'string') {
             $this->manager = new CloudManager($manager);
         } else {
             throw new \Exception('Invalid manager parameter. It should be an instance of CloudManager or an API key string.');