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diff --git a/src/util.h b/src/util.h
index 57ef991..8c3b652 100644
--- a/src/util.h
+++ b/src/util.h
@@ -96,7 +96,7 @@ int _php_event_getsockname(evutil_socket_t fd, zval **ppzaddress, zval **ppzport
#define PHP_EVENT_REQUIRE_BASE_BY_REF(zbase) \
do { \
- if (!Z_ISREF_P((zbase))) { \
+ if (!Z_ISREF_P((zbase)) || Z_REFCOUNT_P(zbase) < 2) { \
php_error_docref(NULL TSRMLS_CC, E_ERROR, \
"EventBase must be passed by reference"); \
} \
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