diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 62296b6..6ec3ff3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -149,9 +149,9 @@ jobs:
         SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
         SLACK_MESSAGE: 'The daily API library tests against mautic/mautic have failed. Most likely a PR was merged recently which introduced a regression of some sort.'
 
-  cs:
+  tests:
     runs-on: ubuntu-20.04
-    name: CS tests
+    name: CS & PHPSTAN tests
 
     steps:
     - uses: actions/checkout@v3
@@ -169,3 +169,6 @@ jobs:
 
     - name: Run CS tests
       run: vendor/bin/php-cs-fixer fix --config=.php-cs-fixer.php -v --dry-run --using-cache=no --show-progress=dots --diff $(git diff -- '*.php' --name-only --diff-filter=ACMRTUXB "HEAD~..HEAD")
+
+    - name: Run PHPSTAN tests
+      run: composer phpstan
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 26aabce..ba85d5a 100644
--- a/composer.json
+++ b/composer.json
@@ -26,13 +26,15 @@
     "kint-php/kint": "^4.1",
     "friendsofphp/php-cs-fixer": "~3.12.0",
     "phpunit/phpunit": "~9.5.0",
-    "guzzlehttp/guzzle": "^7.5"
+    "guzzlehttp/guzzle": "^7.5",
+    "phpstan/phpstan": "^1.11"
   },
   "suggest": {
     "guzzlehttp/guzzle": "A popular HTTP client that implements psr/http-client-implementation."
   },
   "scripts": {
-    "test": "vendor/bin/phpunit"
+    "test": "vendor/bin/phpunit",
+    "phpstan": "vendor/bin/phpstan analyse"
   },
   "config": {
     "allow-plugins": {
diff --git a/lib/MauticApi.php b/lib/MauticApi.php
index 15c44ba..b7bd04c 100644
--- a/lib/MauticApi.php
+++ b/lib/MauticApi.php
@@ -37,7 +37,7 @@ public static function getContext($apiContext, AuthInterface $auth, $baseUrl = '
 
         $apiContext = ucfirst($apiContext);
 
-        if (!isset($context[$apiContext])) {
+        if (!isset($contexts[$apiContext])) {
             $class = 'Mautic\\Api\\'.$apiContext;
 
             if (!class_exists($class)) {
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..6c4b2eb
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,5 @@
+parameters:
+    level: 1
+    paths:
+        - lib
+        - tests
\ No newline at end of file
diff --git a/tests/Api/AssetsTest.php b/tests/Api/AssetsTest.php
index 5fb0041..112e004 100644
--- a/tests/Api/AssetsTest.php
+++ b/tests/Api/AssetsTest.php
@@ -43,12 +43,12 @@ public function testGetListOfSpecificIds()
     public function testCreateWithLocalFileGetAndDelete()
     {
         // Upload a testing file
-        $this->apiFiles = $this->getContext('files');
-        $this->apiFiles->setFolder($this->mediaFolder);
+        $apiFiles = $this->getContext('files');
+        $apiFiles->setFolder($this->mediaFolder);
         $fileRequest = [
             'file' => dirname(__DIR__).'/mauticlogo.png',
         ];
-        $response = $this->apiFiles->create($fileRequest);
+        $response = $apiFiles->create($fileRequest);
         $this->assertErrors($response);
         $file = $response['file'];
 
diff --git a/tests/Api/CampaignsTest.php b/tests/Api/CampaignsTest.php
index 42d68ed..79729ac 100644
--- a/tests/Api/CampaignsTest.php
+++ b/tests/Api/CampaignsTest.php
@@ -471,7 +471,7 @@ public function testCampaignContactEditEvent()
                 $date = new \DateTime($log['triggerDate'], new \DateTimeZone('UTC'));
                 $this->assertEquals($log['triggerDate'], $date->format('c'));
             } else {
-                $this->assertFalse(false, 'Event ID not recognized in the log.', var_export($event, true));
+                $this->fail('Event ID not recognized in the log.'.var_export($event, true));
             }
         }
 
diff --git a/tests/Api/FormsTest.php b/tests/Api/FormsTest.php
index ec98636..814b87a 100644
--- a/tests/Api/FormsTest.php
+++ b/tests/Api/FormsTest.php
@@ -218,10 +218,15 @@ public function testFormSubmissions()
         $response = $this->api->getSubmissions($formId);
         $this->assertErrors($response);
 
+        $submissions = $response['submissions'];
+        $this->assertTrue(count($submissions) > 0, 'Expected at least one form submission');
+
         foreach ($response['submissions'] as $submission) {
             $this->assertSubmission($submission, $formId);
         }
 
+        $submission = end($submissions);
+
         // Try to fetch the last submission
         $response = $this->api->getSubmission($formId, $submission['id']);
         $this->assertErrors($response);
diff --git a/tests/Api/UtmTagsTest.php b/tests/Api/UtmTagsTest.php
index eadffe4..8eca4be 100644
--- a/tests/Api/UtmTagsTest.php
+++ b/tests/Api/UtmTagsTest.php
@@ -99,7 +99,7 @@ public function testAddCheckActiveDateAndDelete()
         $utmIds = $this->addUtmTags();
 
         // check the date; Should be empty
-        $this->assertTrue(empty($response[$this->api->itemName()]['lastActive']));
+        $this->assertTrue(empty($utmIds[$this->api->itemName()]['lastActive']));
 
         // Now add the payload with a known date
         $this->testPayload['lastActive'] = '2017-01-17T00:30:08+00:00';
@@ -150,7 +150,11 @@ protected function removeUtmTags($utmIds)
             }
         }
 
-        $this->assertSame(0, count($response[$this->api->itemName()]['utmtags']), 'Should be no more items');
+        if (!empty($response)) {
+            $this->assertSame(0, count($response[$this->api->itemName()]['utmtags']), 'Should be no more items');
+        } else {
+            $this->fail('Expected a response object');
+        }
     }
 
     protected function addUtmTags()