diff --git a/modules/sharethroughBidAdapter.js b/modules/sharethroughBidAdapter.js
index 21d1561192a4..d53fb0d92dba 100644
--- a/modules/sharethroughBidAdapter.js
+++ b/modules/sharethroughBidAdapter.js
@@ -48,6 +48,20 @@ var SharethroughAdapter = function SharethroughAdapter() {
   function _strcallback(bidObj, bidResponse) {
     try {
       bidResponse = JSON.parse(bidResponse);
+    } catch (e) {
+      _handleInvalidBid(bidObj);
+      return;
+    }
+
+    if (bidResponse.creatives && bidResponse.creatives.length > 0) {
+      _handleBid(bidObj, bidResponse);
+    } else {
+      _handleInvalidBid(bidObj);
+    }
+  }
+
+  function _handleBid(bidObj, bidResponse) {
+    try {
       const bidId = bidResponse.bidId;
       const bid = bidfactory.createBid(1, bidObj);
       bid.bidderCode = STR_BIDDER_CODE;
@@ -91,6 +105,7 @@ var SharethroughAdapter = function SharethroughAdapter() {
 
   function _handleInvalidBid(bidObj) {
     const bid = bidfactory.createBid(2, bidObj);
+    bid.bidderCode = STR_BIDDER_CODE;
     bidmanager.addBidResponse(bidObj.placementCode, bid);
   }
 
diff --git a/test/spec/modules/sharethroughBidAdapter_spec.js b/test/spec/modules/sharethroughBidAdapter_spec.js
index 070f20958bb0..5453e5941556 100644
--- a/test/spec/modules/sharethroughBidAdapter_spec.js
+++ b/test/spec/modules/sharethroughBidAdapter_spec.js
@@ -1,6 +1,7 @@
 import { expect } from 'chai';
 import Adapter from '../../../modules/sharethroughBidAdapter';
 import bidManager from '../../../src/bidmanager';
+import bidfactory from '../../../src/bidfactory';
 
 describe('sharethrough adapter', () => {
   let adapter;
@@ -69,9 +70,11 @@ describe('sharethrough adapter', () => {
     let firstBid;
     let secondBid;
     let server;
+    let stubAddBidResponse;
+    let stubCreateBid;
 
     beforeEach(() => {
-      sandbox.stub(bidManager, 'addBidResponse');
+      stubAddBidResponse = sandbox.stub(bidManager, 'addBidResponse');
       server = sinon.fakeServer.create();
 
       $$PREBID_GLOBAL$$._bidsRequested.push(bidderRequest);
@@ -117,6 +120,7 @@ describe('sharethrough adapter', () => {
 
     afterEach(() => {
       server.restore();
+      stubAddBidResponse.reset();
     });
 
     it('should add a bid object for each bid', () => {
@@ -167,5 +171,70 @@ describe('sharethrough adapter', () => {
       expect(firstBid).to.have.property('pkey', 'aaaa1111');
       expect(secondBid).to.have.property('pkey', 'bbbb2222');
     });
+
+    describe('when bidResponse string cannot be JSON parsed', () => {
+      beforeEach(() => {
+        pbjs._bidsRequested.push(bidderRequest);
+        adapter.str.placementCodeSet['foo'] = {};
+
+        server.respondWith(/aaaa1111/, 'non JSON string');
+        adapter.callBids(bidderRequest);
+
+        server.respond();
+      });
+
+      afterEach(() => {
+        server.restore();
+        stubAddBidResponse.reset();
+      });
+
+      it('should add a bid response', () => {
+        sinon.assert.called(bidManager.addBidResponse);
+      });
+
+      it('should set bidder code on invalid bid response', () => {
+        let bidResponse = bidManager.addBidResponse.firstCall.args[1]
+        expect(bidResponse).to.have.property('bidderCode', 'sharethrough')
+      });
+    });
+
+    describe('when no fill', () => {
+      beforeEach(() => {
+        pbjs._bidsRequested.push(bidderRequest);
+        adapter.str.placementCodeSet['foo'] = {};
+
+        let bidderResponse1 = {
+          'adserverRequestId': '40b6afd5-6134-4fbb-850a-bb8972a46994',
+          'bidId': 'bidId1',
+          'creatives': [
+            {
+              'cpm': 12.34,
+              'auctionWinId': 'b2882d5e-bf8b-44da-a91c-0c11287b8051',
+              'version': 1
+            }
+          ],
+          'stxUserId': ''
+        };
+
+        server.respondWith(/aaaa1111/, JSON.stringify(bidderResponse1));
+        adapter.callBids(bidderRequest);
+
+        server.respond();
+      });
+
+      afterEach(() => {
+        server.restore();
+        stubAddBidResponse.reset();
+      });
+
+      it('should add a bid response', () => {
+        sinon.assert.called(bidManager.addBidResponse);
+      });
+
+      it('should set bidder code on invalid bid response', () => {
+        let bidResponse = bidManager.addBidResponse.firstCall.args[1]
+        expect(bidResponse).to.have.property('bidderCode', 'sharethrough')
+      });
+    });
   });
 });