diff --git a/src/Parser/HTMLParser.php b/src/Parser/HTMLParser.php
index bf8eeab..3ce9e82 100644
--- a/src/Parser/HTMLParser.php
+++ b/src/Parser/HTMLParser.php
@@ -39,16 +39,13 @@ public function grabAttributeFrom(string $xpath, string|array $attributes)
         return $this->getArgumentsFromNode($nodes->getNode(0), $attributes);
     }
 
-    /**
-     * @param  string|array<string>|null  $attribute
-     */
-    public function grabMultiple(string $xpath, $attribute = null): array
+    public function grabMultiple(string $xpath, string|array|null $attribute = null): array
     {
         $result = [];
         $nodes = $this->crawler->filterXPath($xpath);
 
         foreach ($nodes as $node) {
-            $result[] = $attribute !== null ? $this->getArgumentsFromNode($node, $attribute) : $node->textContent;
+            $result[] = $attribute !== null ? $this->getArgumentsFromNode($node, $attribute) : $node->textContent; // @phpstan-ignore argument.templateType
         }
 
         return $result;
diff --git a/src/SnapshotFormatters/SimpleSerializer.php b/src/SnapshotFormatters/SimpleSerializer.php
index de890d8..f086c9b 100644
--- a/src/SnapshotFormatters/SimpleSerializer.php
+++ b/src/SnapshotFormatters/SimpleSerializer.php
@@ -36,6 +36,12 @@ public function toArray(SEOData $data): array
 
     protected function formatTagCollection(TagCollection $collection): ?array
     {
+        $tags = $collection->toArray();
+
+        if ($tags === []) {
+            return null;
+        }
+
         return array_map(
             function ($item) {
                 if (is_array($item)) {
@@ -44,8 +50,8 @@ function ($item) {
 
                 return $this->formatIfUrl($item);
             },
-            $collection->toArray(),
-        ) ?: null;
+            $tags,
+        );
     }
 
     protected function formatIfUrl(?string $url): ?string
diff --git a/src/Support/ArrayPluck.php b/src/Support/ArrayPluck.php
index 7f82ea1..6f196ee 100644
--- a/src/Support/ArrayPluck.php
+++ b/src/Support/ArrayPluck.php
@@ -20,6 +20,10 @@ public function __invoke(string $key, string $value): array
         $results = [];
 
         foreach ($array as $item) {
+            if (! isset($item[$key], $item[$value])) {
+                continue;
+            }
+
             $itemValue = $item[$value];
             $itemKey = $item[$key];
 
diff --git a/src/TestSEO.php b/src/TestSEO.php
index e0310a4..b84e2f7 100644
--- a/src/TestSEO.php
+++ b/src/TestSEO.php
@@ -82,7 +82,9 @@ public function assertTitleIs(string $expected): self
 
     public function assertTitleContains(string $expected): self
     {
-        Assert::assertStringContainsString($expected, $this->data->title());
+        $title = $this->data->title();
+        Assert::assertNotNull($title, 'Title tag is missing.');
+        Assert::assertStringContainsString($expected, $title);
 
         return $this;
     }
@@ -92,7 +94,9 @@ public function assertTitleContains(string $expected): self
      */
     public function assertTitleEndsWith(string $expected): self
     {
-        Assert::assertStringEndsWith($expected, $this->data->title());
+        $title = $this->data->title();
+        Assert::assertNotNull($title, 'Title tag is missing.');
+        Assert::assertStringEndsWith($expected, $title);
 
         return $this;
     }