diff --git a/src/Database/Document.php b/src/Database/Document.php
index 6311841b4..a4bab306b 100644
--- a/src/Database/Document.php
+++ b/src/Database/Document.php
@@ -55,7 +55,7 @@ public function __construct(array $input = [])
      */
     public function getId(): string
     {
-        return $this->getAttribute('$id', '');
+        return $this->getAttribute('$id', '') ?? '';
     }
 
     /**
@@ -63,7 +63,7 @@ public function getId(): string
      */
     public function getInternalId(): string
     {
-        return $this->getAttribute('$internalId', '');
+        return $this->getAttribute('$internalId', '') ?? '';
     }
 
     /**
@@ -71,7 +71,7 @@ public function getInternalId(): string
      */
     public function getCollection(): string
     {
-        return $this->getAttribute('$collection', '');
+        return $this->getAttribute('$collection', '') ?? '';
     }
 
     /**