don't segfault if an exception has been thrown from the fetch handler

diff --git a/ext/pdo/pdo_stmt.c b/ext/pdo/pdo_stmt.c
index 0ec5d16d68b0868719d3db9500134655cc8a564a..d40fe304f7a9c181196273b0f8f2ef2594d55bda 100755 (executable)
--- a/ext/pdo/pdo_stmt.c
+++ b/ext/pdo/pdo_stmt.c
@@ -1055,7 +1055,7 @@ static int do_fetch(pdo_stmt_t *stmt, int do_bind, zval *return_value,
                                        if (return_all) {
                                                zval_ptr_dtor(&return_value); /* we don't need that */
                                                return_value = retval;
-                                       } else {
+                                       } else if (retval) {
                                                *return_value = *retval;
                                                zval_copy_ctor(return_value);
                                                INIT_PZVAL(return_value);