diff --git a/lualib-src/ltls.c b/lualib-src/ltls.c
index 8c50fdea..28488de0 100644
--- a/lualib-src/ltls.c
+++ b/lualib-src/ltls.c
@@ -219,14 +219,17 @@ _ltls_context_read(lua_State* L) {
 
     do {
         read = SSL_read(tls_p->ssl, outbuff, sizeof(outbuff));
-        if(read <= 0) {
+        if(read < 0) {
             int err = SSL_get_error(tls_p->ssl, read);
             ERR_clear_error();
             if(err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
                 break;
             }
             luaL_error(L, "SSL_read error:%d", err);
-        }else if(read <= sizeof(outbuff)) {
+        }else if(read == 0){
+            break;
+        }
+        else if(read <= sizeof(outbuff)) {
             luaL_addlstring(&b, outbuff, read);
         }else {
             luaL_error(L, "invalid SSL_read:%d", read);