diff --git a/src/main/java/graphql/servlet/GraphQLObjectMapper.java b/src/main/java/graphql/servlet/GraphQLObjectMapper.java
index 5e2be1c0..78f5839a 100644
--- a/src/main/java/graphql/servlet/GraphQLObjectMapper.java
+++ b/src/main/java/graphql/servlet/GraphQLObjectMapper.java
@@ -133,7 +133,7 @@ public Map<String, Object> convertSanitizedExecutionResult(ExecutionResult execu
             result.put("errors", executionResult.getErrors());
         }
 
-        if(executionResult.getExtensions() != null){
+        if(executionResult.getExtensions() != null && !executionResult.getExtensions().isEmpty()){
             result.put("extensions", executionResult.getExtensions());
         }