diff --git a/Zend/zend_execute_API.c b/Zend/zend_execute_API.c
index 7bc2522bd48..fa5e13dba2e 100644
--- a/Zend/zend_execute_API.c
+++ b/Zend/zend_execute_API.c
@@ -915,6 +915,8 @@ cleanup_args:
 	}
 
 	if (UNEXPECTED(ZEND_CALL_INFO(call) & ZEND_CALL_MAY_HAVE_UNDEF)) {
+		/* zend_handle_undef_args assumes prev_execute_data is initialized. */
+		call->prev_execute_data = NULL;
 		if (zend_handle_undef_args(call) == FAILURE) {
 			zend_vm_stack_free_args(call);
 			zend_vm_stack_free_call_frame(call);