diff --git a/web/src/store-modules/measurement.ts b/web/src/store-modules/measurement.ts
index 6058e4a..13b9260 100644
--- a/web/src/store-modules/measurement.ts
+++ b/web/src/store-modules/measurement.ts
@@ -54,7 +54,7 @@ export class MeasurementStoreModule extends VuexModule {
     const newMeasurements = existing.slice();
 
     const index = findIndex(existing, { id: measurement.id });
-    if (index > 0) { newMeasurements.push(measurement); }
+    if (index < 0) { newMeasurements.push(measurement); }
     else { newMeasurements[index] = measurement; }
     this.measurements = assign({}, this.measurements, { [measure.id]: newMeasurements });
   }