diff --git a/README.md b/README.md
index a12dd7a..81695a4 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,6 @@ Szkielet komponentu Joomla 6 do gromadzenia pytań testowych.
 
 ## Instalacja
 
-W Joomla wybierz **System → Install → Install from Folder** i wskaż ten katalog. Manifestem instalacyjnym jest `com_testquestions.xml` (wersja 1.42.5).
+W Joomla wybierz **System → Install → Install from Folder** i wskaż ten katalog. Manifestem instalacyjnym jest `com_testquestions.xml` (wersja 1.42.6).
 
 Po instalacji komponent jest dostępny w panelu administratora jako **Pytania testowe**.
diff --git a/administrator/components/com_testquestions/sql/updates/mysql/1.42.6.sql b/administrator/components/com_testquestions/sql/updates/mysql/1.42.6.sql
new file mode 100644
index 0000000..76a0f3f
--- /dev/null
+++ b/administrator/components/com_testquestions/sql/updates/mysql/1.42.6.sql
@@ -0,0 +1 @@
+-- No database changes required for version 1.42.6.
diff --git a/administrator/components/com_testquestions/src/Service/AiService.php b/administrator/components/com_testquestions/src/Service/AiService.php
index 6b13b35..287da2d 100644
--- a/administrator/components/com_testquestions/src/Service/AiService.php
+++ b/administrator/components/com_testquestions/src/Service/AiService.php
@@ -11,14 +11,19 @@ class AiService
     public function evaluate(string $provider, string $apiKey, string $question, string $answer, string $pattern): string
     {
         $provider = strtolower(trim($provider));
+        $provider = preg_replace('/[^a-z]/', '', $provider);
         $config = $provider === 'grok'
             ? ['url' => 'https://api.x.ai/v1/responses', 'model' => 'grok-4.7']
             : ['url' => 'https://api.openai.com/v1/responses', 'model' => 'gpt-4.1-mini'];
 
-        if (!in_array($provider, ['openai', 'grok'], true) || trim($apiKey) === '') {
+        if (trim($apiKey) === '') {
             throw new \RuntimeException('AI_NOT_CONFIGURED');
         }
 
+        if (!in_array($provider, ['openai', 'grok'], true)) {
+            throw new \RuntimeException('Nieprawidłowy dostawca AI: ' . $provider);
+        }
+
         $input = "Oceń odpowiedź ucznia na pytanie otwarte.\n\n"
             . "Pytanie:\n" . $question . "\n\n"
             . "Wzorzec odpowiedzi:\n" . $pattern . "\n\n"
diff --git a/com_testquestions.xml b/com_testquestions.xml
index ea0150f..1a56bee 100644
--- a/com_testquestions.xml
+++ b/com_testquestions.xml
@@ -4,7 +4,7 @@
     <creationDate>2026-10-14</creationDate>
     <author>Komponent</author>
     <license>GNU General Public License version 2 or later</license>
-    <version>1.42.5</version>
+    <version>1.42.6</version>
     <description>COM_TESTQUESTIONS_DESCRIPTION</description>
     <element>com_testquestions</element>
     <namespace path="src">Komponent\Component\Testquestions</namespace>