diff --git a/src/jrd/event.cpp b/src/jrd/event.cpp
index 6a519e333a..7cff5b4808 100644
--- a/src/jrd/event.cpp
+++ b/src/jrd/event.cpp
@@ -278,7 +278,7 @@ SLONG EventManager::queEvents(SLONG session_id,
 
 	// Sanity check
 
-	if (events[0] != EPB_version1)
+	if (events_length && (!events || events[0] != EPB_version1))
 	{
 		Firebird::Arg::Gds(isc_bad_epb_form).raise();
 	}