diff --git a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/common.graphqls b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/common.graphqls
index f698908d5..04f21eeb3 100644
--- a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/common.graphqls
+++ b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/common.graphqls
@@ -93,7 +93,7 @@ type VisualUserNode implements Node {
     # Constant, value = "User"
     name: String!
     # Constant, value = "USER"
-    type: String!
+    type: String
 }
 
 # The Call represents a directed distributed call,