diff --git a/backend/src/tasks/price-feeds/bitfinex-api.ts b/backend/src/tasks/price-feeds/bitfinex-api.ts
index 04bd47732..0e06c3af7 100644
--- a/backend/src/tasks/price-feeds/bitfinex-api.ts
+++ b/backend/src/tasks/price-feeds/bitfinex-api.ts
@@ -13,7 +13,11 @@ class BitfinexApi implements PriceFeed {
 
   public async $fetchPrice(currency): Promise<number> {
     const response = await query(this.url + currency);
-    return response ? parseInt(response['last_price'], 10) : -1;
+    if (response && response['last_price']) {
+      return parseInt(response['last_price'], 10);
+    } else {
+      return -1;
+    }
   }
 
   public async $fetchRecentPrice(currencies: string[], type: 'hour' | 'day'): Promise<PriceHistory> {
diff --git a/backend/src/tasks/price-feeds/bitflyer-api.ts b/backend/src/tasks/price-feeds/bitflyer-api.ts
index 143fbe8d9..72b2e6adf 100644
--- a/backend/src/tasks/price-feeds/bitflyer-api.ts
+++ b/backend/src/tasks/price-feeds/bitflyer-api.ts
@@ -13,7 +13,11 @@ class BitflyerApi implements PriceFeed {
 
   public async $fetchPrice(currency): Promise<number> {
     const response = await query(this.url + currency);
-    return response ? parseInt(response['ltp'], 10) : -1;
+    if (response && response['ltp']) {
+      return parseInt(response['ltp'], 10);
+    } else {
+      return -1;
+    }
   }
 
   public async $fetchRecentPrice(currencies: string[], type: 'hour' | 'day'): Promise<PriceHistory> {
diff --git a/backend/src/tasks/price-feeds/coinbase-api.ts b/backend/src/tasks/price-feeds/coinbase-api.ts
index ef28b0d80..424ac8867 100644
--- a/backend/src/tasks/price-feeds/coinbase-api.ts
+++ b/backend/src/tasks/price-feeds/coinbase-api.ts
@@ -13,7 +13,11 @@ class CoinbaseApi implements PriceFeed {
 
   public async $fetchPrice(currency): Promise<number> {
     const response = await query(this.url + currency);
-    return response ? parseInt(response['data']['amount'], 10) : -1;
+    if (response && response['data'] && response['data']['amount']) {
+      return parseInt(response['data']['amount'], 10);
+    } else {
+      return -1;
+    }
   }
 
   public async $fetchRecentPrice(currencies: string[], type: 'hour' | 'day'): Promise<PriceHistory> {
diff --git a/backend/src/tasks/price-feeds/gemini-api.ts b/backend/src/tasks/price-feeds/gemini-api.ts
index abd8e0939..fc86dc0a3 100644
--- a/backend/src/tasks/price-feeds/gemini-api.ts
+++ b/backend/src/tasks/price-feeds/gemini-api.ts
@@ -13,7 +13,11 @@ class GeminiApi implements PriceFeed {
 
   public async $fetchPrice(currency): Promise<number> {
     const response = await query(this.url + currency);
-    return response ? parseInt(response['last'], 10) : -1;
+    if (response && response['last']) {
+      return parseInt(response['last'], 10);
+    } else {
+      return -1;
+    }
   }
 
   public async $fetchRecentPrice(currencies: string[], type: 'hour' | 'day'): Promise<PriceHistory> {
diff --git a/backend/src/tasks/price-feeds/kraken-api.ts b/backend/src/tasks/price-feeds/kraken-api.ts
index ddb3c4f65..cc8fa132c 100644
--- a/backend/src/tasks/price-feeds/kraken-api.ts
+++ b/backend/src/tasks/price-feeds/kraken-api.ts
@@ -23,7 +23,14 @@ class KrakenApi implements PriceFeed {
 
   public async $fetchPrice(currency): Promise<number> {
     const response = await query(this.url + currency);
-    return response ? parseInt(response['result'][this.getTicker(currency)]['c'][0], 10) : -1;
+    const ticker = this.getTicker(currency);
+    if (response && response['result'] && response['result'][ticker] &&
+      response['result'][ticker]['c'] && response['result'][ticker]['c'].length > 0
+    ) {
+      return parseInt(response['result'][ticker]['c'][0], 10);
+    } else {
+      return -1;
+    }
   }
 
   public async $fetchRecentPrice(currencies: string[], type: 'hour' | 'day'): Promise<PriceHistory> {
diff --git a/backend/src/tasks/price-updater.ts b/backend/src/tasks/price-updater.ts
index e069e4db4..e2d00ec7b 100644
--- a/backend/src/tasks/price-updater.ts
+++ b/backend/src/tasks/price-updater.ts
@@ -127,7 +127,11 @@ class PriceUpdater {
 
       // Compute average price, non weighted
       prices = prices.filter(price => price > 0);
-      this.latestPrices[currency] = Math.round((prices.reduce((partialSum, a) => partialSum + a, 0)) / prices.length);
+      if (prices.length === 0) {
+        this.latestPrices[currency] = -1;
+      } else {
+        this.latestPrices[currency] = Math.round((prices.reduce((partialSum, a) => partialSum + a, 0)) / prices.length);
+      }
     }
 
     logger.info(`Latest BTC fiat averaged price: ${JSON.stringify(this.latestPrices)}`);