diff --git a/src/EbmlBinary.cpp b/src/EbmlBinary.cpp
index 8c801358..f4ab468d 100644
--- a/src/EbmlBinary.cpp
+++ b/src/EbmlBinary.cpp
@@ -79,6 +79,8 @@ filepos_t EbmlBinary::ReadData(IOCallback & input, ScopeMode ReadFully)
 
 bool EbmlBinary::operator==(const EbmlBinary & ElementToCompare) const
 {
+  if (!ValueIsSet() || !ElementToCompare.ValueIsSet())
+    return false;
   return ((GetSize() == ElementToCompare.GetSize()) && (GetSize() == 0 || !memcmp(Data, ElementToCompare.Data, GetSize())));
 }