diff --git a/src/nostalgia/modules/core/src/studio/tilesheeteditor/commands/inserttilescommand.cpp b/src/nostalgia/modules/core/src/studio/tilesheeteditor/commands/inserttilescommand.cpp
index 3a986439..9651feed 100644
--- a/src/nostalgia/modules/core/src/studio/tilesheeteditor/commands/inserttilescommand.cpp
+++ b/src/nostalgia/modules/core/src/studio/tilesheeteditor/commands/inserttilescommand.cpp
@@ -6,7 +6,7 @@
 
 namespace nostalgia::core {
 
-core::InsertTilesCommand::InsertTilesCommand(
+InsertTilesCommand::InsertTilesCommand(
 		TileSheet &img,
 		TileSheet::SubSheetIdx idx,
 		std::size_t tileIdx,
@@ -31,9 +31,11 @@ ox::Error InsertTilesCommand::redo() noexcept {
 	auto &s = getSubSheet(m_img, m_idx);
 	auto &p = s.pixels;
 	auto dstPos = m_insertPos + m_insertCnt;
-	auto const dst = &p[dstPos];
 	auto const src = &p[m_insertPos];
-	ox::memmove(dst, src, p.size() - dstPos);
+	if (dstPos < p.size()) {
+		auto const dst = &p[dstPos];
+		ox::memmove(dst, src, p.size() - dstPos);
+	}
 	ox::memset(src, 0, m_insertCnt * sizeof(decltype(p[0])));
 	return {};
 }
@@ -41,12 +43,14 @@ ox::Error InsertTilesCommand::redo() noexcept {
 ox::Error InsertTilesCommand::undo() noexcept {
 	auto &s = getSubSheet(m_img, m_idx);
 	auto &p = s.pixels;
-	auto const srcIdx = m_insertPos + m_insertCnt;
-	auto const src = &p[srcIdx];
 	auto const dst1 = &p[m_insertPos];
 	auto const dst2 = &p[p.size() - m_insertCnt];
-	auto const sz = p.size() - srcIdx;
-	ox::memmove(dst1, src, sz);
+	auto const srcIdx = m_insertPos + m_insertCnt;
+	if (srcIdx < p.size()) {
+		auto const sz = p.size() - srcIdx;
+		auto const src = &p[srcIdx];
+		ox::memmove(dst1, src, sz);
+	}
 	ox::memcpy(dst2, m_deletedPixels.data(), m_deletedPixels.size());
 	return {};
 }
diff --git a/src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditorview.cpp b/src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditorview.cpp
index 0cf1d87d..2181d864 100644
--- a/src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditorview.cpp
+++ b/src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditorview.cpp
@@ -56,8 +56,10 @@ void TileSheetEditorView::scrollH(ox::Vec2 const&paneSz, float wheelh) noexcept
 }
 
 void TileSheetEditorView::insertTile(ox::Vec2 const&paneSize, ox::Vec2 const&clickPos) noexcept {
-	auto const pt = clickPoint(paneSize, clickPos);
+	auto pt = clickPoint(paneSize, clickPos);
 	auto const&s = m_model.activeSubSheet();
+	pt.x = ox::min(pt.x, s.columns * TileWidth);
+	pt.y = ox::min(pt.y, s.rows * TileHeight);
 	auto const tileIdx = ptToIdx(pt, s.columns) / PixelsPerTile;
 	m_model.insertTiles(m_model.activeSubSheetIdx(), tileIdx, 1);
 }