diff --git a/src/main/java/com/amihaiemil/eoyaml/YamlMapping.java b/src/main/java/com/amihaiemil/eoyaml/YamlMapping.java
index 1e5e3dee..f1c0f9c0 100644
--- a/src/main/java/com/amihaiemil/eoyaml/YamlMapping.java
+++ b/src/main/java/com/amihaiemil/eoyaml/YamlMapping.java
@@ -529,6 +529,8 @@ default JsonObject toJsonObject() {
      *  using a visitor.
      */
     default <T> T toObject(final Class<T> clazz) {
-        return null;
+        throw new UnsupportedOperationException(
+            "Not yet implemented. See decorators-squad/eo-yaml#631"
+        );
     }
 }