diff --git a/src/FieldDescription/TypeGuesserChain.php b/src/FieldDescription/TypeGuesserChain.php
index d4abee8554..9f8a29ba97 100644
--- a/src/FieldDescription/TypeGuesserChain.php
+++ b/src/FieldDescription/TypeGuesserChain.php
@@ -56,7 +56,7 @@ public function __construct(array $guessers)
         $this->guessers = array_merge(...$allGuessers);
     }
 
-    public function guess(FieldDescriptionInterface $fieldDescription): TypeGuess
+    public function guess(FieldDescriptionInterface $fieldDescription): ?TypeGuess
     {
         $guesses = [];
 
@@ -69,7 +69,10 @@ public function guess(FieldDescriptionInterface $fieldDescription): TypeGuess
                 ));
             }
 
-            $guesses[] = $guesser->guess($fieldDescription);
+            $guess = $guesser->guess($fieldDescription);
+            if (null !== $guess) {
+                $guesses[] = $guess;
+            }
         }
 
         return TypeGuess::getBestGuess($guesses);
diff --git a/src/FieldDescription/TypeGuesserInterface.php b/src/FieldDescription/TypeGuesserInterface.php
index b97363ef87..a8731d5479 100644
--- a/src/FieldDescription/TypeGuesserInterface.php
+++ b/src/FieldDescription/TypeGuesserInterface.php
@@ -17,5 +17,5 @@
 
 interface TypeGuesserInterface
 {
-    public function guess(FieldDescriptionInterface $fieldDescription): TypeGuess;
+    public function guess(FieldDescriptionInterface $fieldDescription): ?TypeGuess;
 }