diff --git a/tap_zendesk/schemas/agents_activity.json b/tap_zendesk/schemas/agents_activity.json
index 5cee941..904f6c3 100644
--- a/tap_zendesk/schemas/agents_activity.json
+++ b/tap_zendesk/schemas/agents_activity.json
@@ -95,7 +95,8 @@
         ]
           },
           "call_status": {
-            "type": "null"
+            "type":[ "null",
+            "string"]
           },
           "agent_state": {
             "type": [