diff --git a/packages/service-worker/worker/src/data.ts b/packages/service-worker/worker/src/data.ts
index 4d9fdd7242..8ba1f6b372 100644
--- a/packages/service-worker/worker/src/data.ts
+++ b/packages/service-worker/worker/src/data.ts
@@ -275,7 +275,15 @@ export class DataGroup {
       return;
     }
     const table = await this.lruTable;
-    return table.write('lru', this._lru !.state);
+    try {
+      return table.write('lru', this._lru !.state);
+    } catch (err) {
+      // Writing lru cache table failed. This could be a result of a full storage.
+      // Continue serving clients as usual.
+      this.debugHandler.log(err, `DataGroup(${this.config.name}@${this.config.version}).syncLru()`);
+      // TODO: Better detect/handle full storage; e.g. using
+      // [navigator.storage](https://developer.mozilla.org/en-US/docs/Web/API/NavigatorStorage/storage).
+    }
   }
 
   /**
diff --git a/packages/service-worker/worker/test/happy_spec.ts b/packages/service-worker/worker/test/happy_spec.ts
index 54b313509f..2c990cc3a2 100644
--- a/packages/service-worker/worker/test/happy_spec.ts
+++ b/packages/service-worker/worker/test/happy_spec.ts
@@ -1330,6 +1330,27 @@ import {SwTestHarness, SwTestHarnessBuilder} from '../testing/scope';
            server.assertSawRequestFor('/api-static/bar');
          });
 
+      it('keeps serving mutating api requests when failing to write to cache',
+         // sw can invalidate LRU cache entry and try to write to cache storage on mutating request
+         async() => {
+           // Initialize the SW.
+           expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
+           await driver.initialized;
+           server.clearRequests();
+
+           // Make the caches unwritable.
+           spyOn(MockCache.prototype, 'put').and.throwError('Can\'t touch this');
+           spyOn(driver.debugger, 'log');
+           expect(await makeRequest(scope, '/api/foo', 'default', {
+             method: 'post'
+           })).toEqual('this is api foo');
+           expect(driver.state).toBe(DriverReadyState.NORMAL);
+           // Since we are swallowing an error here, make sure it is at least properly logged
+           expect(driver.debugger.log)
+               .toHaveBeenCalledWith(new Error('Can\'t touch this'), 'DataGroup(api@42).syncLru()');
+           server.assertSawRequestFor('/api/foo');
+         });
+
       it('enters degraded mode when something goes wrong with the latest version', async() => {
         await driver.initialized;