diff --git a/presto-ui/src/utils.js b/presto-ui/src/utils.js
index 64cdd2f1a933b..0deaca252ca2b 100644
--- a/presto-ui/src/utils.js
+++ b/presto-ui/src/utils.js
@@ -325,6 +325,9 @@ export function computeRate(count: number, ms: number): number {
 }
 
 export function precisionRound(n: number): string {
+    if (n === undefined) {
+        return "";
+    }
     if (n < 10) {
         return n.toFixed(2);
     }