diff --git a/src/Extensions/Extensions/TextAlign.php b/src/Extensions/Extensions/TextAlign.php
index ace6420b..5751a3d5 100644
--- a/src/Extensions/Extensions/TextAlign.php
+++ b/src/Extensions/Extensions/TextAlign.php
@@ -28,7 +28,7 @@ public function addGlobalAttributes(): array
                         'default' => $this->options['defaultAlignment'],
                         'parseHTML' => fn ($DOMNode) => InlineStyle::getAttribute($DOMNode, 'text-align') ?? $this->options['defaultAlignment'],
                         'renderHTML' => function ($attributes) {
-                            if (property_exists($attributes, 'style') && str_contains($attributes->style, 'text-align')) {
+                            if (property_exists($attributes, 'style') && str_contains($attributes->style ?? '', 'text-align')) {
                                 return null;
                             }
 
diff --git a/src/Extensions/Marks/Link.php b/src/Extensions/Marks/Link.php
index 864413a7..8b450d7b 100644
--- a/src/Extensions/Marks/Link.php
+++ b/src/Extensions/Marks/Link.php
@@ -75,7 +75,7 @@ public function addAttributes(): array
                     return null;
                 },
                 'renderHTML' => function ($attributes) {
-                    if (! property_exists($attributes, 'button_theme') || strlen($attributes->button_theme) === 0) {
+                    if (! property_exists($attributes, 'button_theme') || strlen($attributes->button_theme ?? '') === 0) {
                         return null;
                     }
 
diff --git a/src/TiptapConverter.php b/src/TiptapConverter.php
index 5f195099..2530ae38 100644
--- a/src/TiptapConverter.php
+++ b/src/TiptapConverter.php
@@ -100,8 +100,12 @@ public function mergeTagsMap(array $mergeTagsMap): static
         return $this;
     }
 
-    public function asHTML(string | array $content, bool $toc = false, int $maxDepth = 3): string
+    public function asHTML(string | array | null $content, bool $toc = false, int $maxDepth = 3): string
     {
+        if (! $content) {
+            return '';
+        }
+
         $editor = $this->getEditor()->setContent($content);
 
         if ($toc) {
@@ -118,8 +122,12 @@ public function asHTML(string | array $content, bool $toc = false, int $maxDepth
         return str_replace('</code></pre></code></pre>', '</code></pre>', $editor->getHTML());
     }
 
-    public function asJSON(string | array $content, bool $decoded = false, bool $toc = false, int $maxDepth = 3): string | array
+    public function asJSON(string | array | null $content, bool $decoded = false, bool $toc = false, int $maxDepth = 3): string | array
     {
+        if (! $content) {
+            return '';
+        }
+
         $editor = $this->getEditor()->setContent($content);
 
         if ($toc) {
@@ -133,8 +141,12 @@ public function asJSON(string | array $content, bool $decoded = false, bool $toc
         return $decoded ? json_decode($editor->getJSON(), true) : $editor->getJSON();
     }
 
-    public function asText(string | array $content): string
+    public function asText(string | array | null $content): string
     {
+        if (! $content) {
+            return '';
+        }
+
         $editor = $this->getEditor()->setContent($content);
 
         if (filled($this->mergeTagsMap)) {
@@ -144,8 +156,12 @@ public function asText(string | array $content): string
         return $editor->getText();
     }
 
-    public function asTOC(string | array $content, int $maxDepth = 3, bool $array = false): string | array
+    public function asTOC(string | array | null $content, int $maxDepth = 3, bool $array = false): string | array
     {
+        if (! $content) {
+            return '';
+        }
+
         if (is_string($content)) {
             $content = $this->asJSON($content, decoded: true);
         }