1 files changed, 3 insertions, 3 deletions

diff --git a/src/gnutls_io.c b/src/gnutls_io.c
index 4a550c3..a434eb5 100644
--- a/src/gnutls_io.c
+++ b/src/gnutls_io.c
@@ -666,9 +666,9 @@ ssize_t mgs_transport_read(gnutls_transport_ptr_t ptr,
         ctxt->input_rc = APR_SUCCESS;
 
         /* If Len = 0, we don't do anything. */
-        if (!len)
-                return 0;
-
+        if (!len || buffer == NULL) {
+                return 0;
+        }
         if (!ctxt->input_bb) {
                 ctxt->input_rc = APR_EOF;
                 return -1;