diff --git a/backend/src/repositories/PricesRepository.ts b/backend/src/repositories/PricesRepository.ts
index 61d092ca6..a3b4f2fb9 100644
--- a/backend/src/repositories/PricesRepository.ts
+++ b/backend/src/repositories/PricesRepository.ts
@@ -4,6 +4,12 @@ import { Prices } from '../tasks/price-updater';
 
 class PricesRepository {
   public async $savePrices(time: number, prices: Prices): Promise<void> {
+    if (prices.USD === -1) {
+      // Some historical price entries have not USD prices, so we just ignore them to avoid future UX issues
+      // As of today there are only 4 (on 2013-09-05, 2013-09-19, 2013-09-12 and 2013-09-26) so that's fine
+      return;
+    }
+
     try {
       await DB.query(`
         INSERT INTO prices(time,             USD, EUR, GBP, CAD, CHF, AUD, JPY)
@@ -17,17 +23,17 @@ class PricesRepository {
   }
 
   public async $getOldestPriceTime(): Promise<number> {
-    const [oldestRow] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time from prices ORDER BY time LIMIT 1`);
+    const [oldestRow] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time from prices WHERE USD != -1 ORDER BY time LIMIT 1`);
     return oldestRow[0] ? oldestRow[0].time : 0;
   }
 
   public async $getLatestPriceTime(): Promise<number> {
-    const [oldestRow] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time from prices ORDER BY time DESC LIMIT 1`);
+    const [oldestRow] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time from prices WHERE USD != -1 ORDER BY time DESC LIMIT 1`);
     return oldestRow[0] ? oldestRow[0].time : 0;
   }
 
   public async $getPricesTimes(): Promise<number[]> {
-    const [times]: any[] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time from prices`);
+    const [times]: any[] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time from prices WHERE USD != -1`);
     return times.map(time => time.time);
   }
 }