diff --git a/ghost/tiers/lib/Tier.js b/ghost/tiers/lib/Tier.js
index 6b0345c0a6..133e95e513 100644
--- a/ghost/tiers/lib/Tier.js
+++ b/ghost/tiers/lib/Tier.js
@@ -419,6 +419,9 @@ function validateMonthlyPrice(value, type) {
         }
         return null;
     }
+    if (!value) {
+        return 500;
+    }
     if (!Number.isSafeInteger(value)) {
         throw new ValidationError({
             message: 'Tier prices must be an integer.'
@@ -446,6 +449,9 @@ function validateYearlyPrice(value, type) {
         }
         return null;
     }
+    if (!value) {
+        return 5000;
+    }
     if (!Number.isSafeInteger(value)) {
         throw new ValidationError({
             message: 'Tier prices must be an integer.'
diff --git a/ghost/tiers/test/Tier.test.js b/ghost/tiers/test/Tier.test.js
index 6037de7602..6528ddf42c 100644
--- a/ghost/tiers/test/Tier.test.js
+++ b/ghost/tiers/test/Tier.test.js
@@ -52,11 +52,9 @@ const invalidInputs = [
     {currency: 25},
     {currency: 'USD', type: 'free'},
     {monthlyPrice: 2000, type: 'free', trialDays: null, currency: null, yearlyPrice: null},
-    {monthlyPrice: null},
     {monthlyPrice: -20},
     {monthlyPrice: 10000000000},
     {yearlyPrice: 2000, type: 'free', trialDays: null, monthlyPrice: null, currency: null},
-    {yearlyPrice: null},
     {yearlyPrice: -20},
     {yearlyPrice: 10000000000},
     {createdAt: 'Today'},
@@ -87,6 +85,17 @@ describe('Tier', function () {
             }
         });
 
+        it('Uses default monthly and yearly price if they are set to 0', async function () {
+            const tier = await Tier.create({
+                ...validInput,
+                monthlyPrice: 0,
+                yearlyPrice: 0
+            });
+
+            assert.equal(tier.getPrice('month'), 500);
+            assert.equal(tier.getPrice('year'), 5000);
+        });
+
         it('Does not error for valid inputs', async function () {
             for (const validInputItem of validInputs) {
                 let input = {};