diff --git a/src/app/puzzle/vpmainwindow.cpp b/src/app/puzzle/vpmainwindow.cpp
index 316ef77c9..dcaa51d82 100644
--- a/src/app/puzzle/vpmainwindow.cpp
+++ b/src/app/puzzle/vpmainwindow.cpp
@@ -596,7 +596,7 @@ void VPMainWindow::ImportRawLayouts(const QStringList &rawLayouts)
                         }
                     }
 
-                    piece->SetSheet(nullptr); // just in case
+                    piece->SetSheet(VPSheetPtr()); // just in case
                     VPLayout::AddPiece(m_layout, piece);
                 }
             }