diff --git a/frontend_tests/node_tests/dispatch.js b/frontend_tests/node_tests/dispatch.js
index e1a874e7b5..74fdfa9951 100644
--- a/frontend_tests/node_tests/dispatch.js
+++ b/frontend_tests/node_tests/dispatch.js
@@ -894,4 +894,6 @@ run_test("server_event_dispatch_op_errors", () => {
     server_events_dispatch.dispatch_normal_event({type: "realm_domains", op: "other"});
     blueslip.expect("error", "Unexpected event type realm_user/other");
     server_events_dispatch.dispatch_normal_event({type: "realm_user", op: "other"});
+    blueslip.expect("error", "Unexpected event type stream/other");
+    server_events_dispatch.dispatch_normal_event({type: "stream", op: "other"});
 });
diff --git a/static/js/server_events_dispatch.js b/static/js/server_events_dispatch.js
index 1528824a6b..71c1bf40ca 100644
--- a/static/js/server_events_dispatch.js
+++ b/static/js/server_events_dispatch.js
@@ -437,6 +437,9 @@ export function dispatch_normal_event(event) {
                         }
                     }
                     break;
+                default:
+                    blueslip.error("Unexpected event type stream/" + event.op);
+                    break;
             }
             break;