diff --git a/src/RuleFailureTelemetry.js b/src/RuleFailureTelemetry.js
index 5136305..371df96 100644
--- a/src/RuleFailureTelemetry.js
+++ b/src/RuleFailureTelemetry.js
@@ -14,10 +14,10 @@ class RuleFailureTelemetry extends BaseEntity {
       stacktrace: "string",
       closed: {type: "bool", default: false},
       errorDateTime: "date",
-      sourceType: "string",
-      sourceId: "string",
-      entityType: "string",
-      entityId: "string",
+      sourceType: {type: "string", optional: true},
+      sourceId: {type: "string", optional: true},
+      entityType: {type: "string", optional: true},
+      entityId: {type: "string", optional: true},
       appType: "string",
     },
   };