diff --git a/dashboards/Query Analytics/pmm-qan.json b/dashboards/Query Analytics/pmm-qan.json
index b70cda1f22..349faebfe8 100644
--- a/dashboards/Query Analytics/pmm-qan.json	
+++ b/dashboards/Query Analytics/pmm-qan.json	
@@ -112,7 +112,7 @@
             "options": {},
             "targets": [
                 {
-                    "expr": "",
+                    "expr": "{}",
                     "format": "time_series",
                     "intervalFactor": 2,
                     "refId": "A"