diff --git a/src/net/http/client.go b/src/net/http/client.go
index a496f1c0c75..ec24516833c 100644
--- a/src/net/http/client.go
+++ b/src/net/http/client.go
@@ -265,6 +265,12 @@ func send(ireq *Request, rt RoundTripper, deadline time.Time) (resp *Response, d
 		}
 		return nil, didTimeout, err
 	}
+	if resp == nil {
+		return nil, didTimeout, fmt.Errorf("http: RoundTripper implementation (%T) returned a nil *Response with a nil error", rt)
+	}
+	if resp.Body == nil {
+		return nil, didTimeout, fmt.Errorf("http: RoundTripper implementation (%T) returned a *Response with a nil Body", rt)
+	}
 	if !deadline.IsZero() {
 		resp.Body = &cancelTimerBody{
 			stop:          stopTimer,