diff --git a/src/insets/Inset.cpp b/src/insets/Inset.cpp
index 3ab5f33bc4..0935b06278 100644
--- a/src/insets/Inset.cpp
+++ b/src/insets/Inset.cpp
@@ -224,7 +224,7 @@ bool Inset::isBufferLoaded() const
 bool Inset::isBufferValid() const
 {
 	return buffer_
-		&& (isBufferLoaded() || buffer_->isClone());
+		&& (isBufferLoaded() || buffer_->isInternal() || buffer_->isClone());
 }