diff --git a/modules/yieldmoBidAdapter.js b/modules/yieldmoBidAdapter.js
index f606194e132..de0fbc12b9c 100644
--- a/modules/yieldmoBidAdapter.js
+++ b/modules/yieldmoBidAdapter.js
@@ -196,7 +196,10 @@ export const spec = {
    */
   interpretResponse: function (serverResponse, bidRequest) {
     const bids = [];
-    const data = serverResponse.body;
+    const data = serverResponse && serverResponse.body;
+    if (!data) {
+      return bids;
+    }
     if (data.length > 0) {
       data.forEach(response => {
         if (response.cpm > 0) {
@@ -206,7 +209,12 @@ export const spec = {
     }
     if (data.seatbid) {
       const seatbids = data.seatbid.reduce((acc, seatBid) => acc.concat(seatBid.bid), []);
-      seatbids.forEach(bid => bids.push(createNewVideoBid(bid, bidRequest)));
+      seatbids.forEach(bid => {
+        const videoBid = createNewVideoBid(bid, bidRequest);
+        if (videoBid) {
+          bids.push(videoBid);
+        }
+      });
     }
     return bids;
   },
@@ -328,6 +336,14 @@ function createNewBannerBid(response) {
 function createNewVideoBid(response, bidRequest) {
   const imp = (deepAccess(bidRequest, 'data.imp') || []).find(imp => imp.id === response.impid);
 
+  // A response bid whose impid doesn't match a requested imp can't be built
+  // (imp.id / imp.video.* would throw). Skip it so one malformed bid doesn't
+  // abort interpretResponse and drop every other bid in the response; the
+  // caller filters out this null.
+  if (!imp) {
+    return null;
+  }
+
   const result = {
     dealId: response.dealid,
     requestId: imp.id,
@@ -525,7 +541,13 @@ function getBidFloor(bidRequest, mediaType) {
   let floorInfo = {};
 
   if (typeof bidRequest.getFloor === 'function') {
-    floorInfo = bidRequest.getFloor({ currency: CURRENCY, mediaType, size: '*' });
+    // getFloor can throw or return undefined (e.g. no matching floor rule);
+    // guard both so a floors misconfig can't drop the bid.
+    try {
+      floorInfo = bidRequest.getFloor({ currency: CURRENCY, mediaType, size: '*' }) || {};
+    } catch (e) {
+      logError('Yieldmo: getFloor threw; falling back to params bidfloor', e);
+    }
   }
 
   return floorInfo.floor || bidRequest.params.bidfloor || bidRequest.params.bidFloor || 0;
diff --git a/test/spec/modules/yieldmoBidAdapter_spec.js b/test/spec/modules/yieldmoBidAdapter_spec.js
index 4f4454c17ae..3e138153132 100644
--- a/test/spec/modules/yieldmoBidAdapter_spec.js
+++ b/test/spec/modules/yieldmoBidAdapter_spec.js
@@ -329,6 +329,16 @@ describe('YieldmoAdapter', function () {
         expect(placementsData[1].bidFloor).to.equal(1.23);
       });
 
+      it('should fall back to params bidFloor when getFloor throws or returns undefined (no throw)', function () {
+        const throwing = mockBannerBid({ getFloor: () => { throw new Error('boom'); } }, { bidFloor: 0.42 });
+        expect(() => build([throwing])).to.not.throw();
+        expect(JSON.parse(buildAndGetPlacementInfo([throwing]))[0].bidFloor).to.equal(0.42);
+
+        const undef = mockBannerBid({ getFloor: () => undefined }, { bidFloor: 0.42 });
+        expect(() => build([undef])).to.not.throw();
+        expect(JSON.parse(buildAndGetPlacementInfo([undef]))[0].bidFloor).to.equal(0.42);
+      });
+
       it('should use bidFloor if no floors module is available', function() {
         const placementsData = JSON.parse(buildAndGetPlacementInfo([
           mockBannerBid({}, { bidFloor: 1.2 }),
@@ -920,6 +930,44 @@ describe('YieldmoAdapter', function () {
       });
     });
 
+    it('should skip a video bid whose impid does not match a requested imp, keeping the rest', function () {
+      const response = mockServerResponse();
+      const seatbid = [
+        {
+          bid: {
+            adm: '<?xml version="1.0" encoding="UTF-8"?>',
+            adomain: ['www.example.com'],
+            crid: 'unmatched-crid',
+            impid: 'no-such-imp',
+            price: 1.5,
+            dealid: 'YMO_456'
+          },
+        },
+        {
+          bid: {
+            adm: '<?xml version="1.0" encoding="UTF-8"?>',
+            adomain: ['www.example.com'],
+            crid: 'matched-crid',
+            impid: '91ea8bba1',
+            price: 2.0,
+            dealid: 'YMO_789'
+          },
+        },
+      ];
+      const bidRequest = {
+        data: { imp: [{ id: '91ea8bba1', video: { h: 250, w: 300 } }] },
+      };
+      response.body.seatbid = seatbid;
+
+      // The unmatched bid must be skipped (not throw), and must not drop the
+      // matching video bid.
+      const newResponse = spec.interpretResponse(response, bidRequest);
+      const videoBids = newResponse.filter(b => b.mediaType === 'video');
+      expect(videoBids.length).to.equal(1);
+      expect(videoBids[0].requestId).to.equal('91ea8bba1');
+      expect(videoBids[0].creativeId).to.equal('matched-crid');
+    });
+
     it('should not add responses if the cpm is 0 or null', function () {
       const response = mockServerResponse();
       response.body[0].cpm = 0;
@@ -928,6 +976,13 @@ describe('YieldmoAdapter', function () {
       response.body[0].cpm = null;
       expect(spec.interpretResponse(response)).to.deep.equal([]);
     });
+
+    it('should return [] (not throw) when the response body is missing or null', function () {
+      expect(spec.interpretResponse({ body: null })).to.deep.equal([]);
+      expect(spec.interpretResponse({ body: undefined })).to.deep.equal([]);
+      expect(spec.interpretResponse({})).to.deep.equal([]);
+      expect(() => spec.interpretResponse(undefined)).to.not.throw();
+    });
   });
 
   describe('getUserSync', function () {