diff --git a/src/Service/Decoder/JsonResponseDecoder.php b/src/Service/Decoder/JsonResponseDecoder.php
index 15e6446..605d14f 100644
--- a/src/Service/Decoder/JsonResponseDecoder.php
+++ b/src/Service/Decoder/JsonResponseDecoder.php
@@ -52,7 +52,7 @@ public function getDecodedResponse(Request $request)
             }
 
             if (json_last_error() !== JSON_ERROR_NONE) {
-                $decodedResponse = $response->getBody()->getContents();
+                return $response->getBody()->getContents();
             }
 
             if ($this->cacheEndpoint) {
diff --git a/tests/Service/Decoder/JsonResponseDecoderTest.php b/tests/Service/Decoder/JsonResponseDecoderTest.php
index 09ff6b5..51fcd15 100644
--- a/tests/Service/Decoder/JsonResponseDecoderTest.php
+++ b/tests/Service/Decoder/JsonResponseDecoderTest.php
@@ -145,7 +145,6 @@ public function testGetDecodedResponseThrowsNetworkExceptionWhenClientFailsAndNo
     }
 
     /**
-     * @todo this seems like a bug, we should not store in the cache invalid json? should we throw an error?
      * @throws \Http\Client\Exception
      * @throws \Psr\SimpleCache\InvalidArgumentException
      */
@@ -159,7 +158,7 @@ public function testGetDecodedResponseReturnsBodyWhenJsonDecodingFails()
         $response->getBody()->willReturn($this->getResponseBodyStub('{invalid_json'));
 
         $this->client->sendRequest($request)->willReturn($response->reveal());
-        $this->simpleCache->set('4429b090fd82239e188859ae626162e5e790b4db', '{invalid_json')->shouldBeCalledOnce();
+        $this->simpleCache->set('4429b090fd82239e188859ae626162e5e790b4db', '{invalid_json')->shouldNotBeCalled();
 
         $this->assertSame(
             '{invalid_json',