diff --git a/filters.cpp b/filters.cpp
index 09f9a956..537318d1 100644
--- a/filters.cpp
+++ b/filters.cpp
@@ -514,6 +514,7 @@ size_t RandomNumberSink::Put2(const byte *begin, size_t length, int messageEnd,
 
 size_t ArraySink::Put2(const byte *begin, size_t length, int messageEnd, bool blocking)
 {
+	if(!begin || !length) return length;
 	if (m_buf+m_total != begin)
 		memcpy(m_buf+m_total, begin, STDMIN(length, SaturatingSubtract(m_size, m_total)));
 	m_total += length;