diff --git a/src/providers/gain.ts b/src/providers/gain.ts
index 77ab2de..8a5e908 100644
--- a/src/providers/gain.ts
+++ b/src/providers/gain.ts
@@ -57,7 +57,7 @@ export class AvgChangeProvider {
             arrLoss.push(localLoss);
 
             if (!this.filled) {
-                return;
+                return { gain: undefined, loss: undefined, prev: value };
             }
 
             gain = avg(arrGain, this.period);