diff --git a/crates/editor/src/display_map/block_map.rs b/crates/editor/src/display_map/block_map.rs
index 2673baae84ab74b2852004320cf1d94c5ed1ed42..d45165660d92170ecc176ebd8e038b890933bd57 100644
--- a/crates/editor/src/display_map/block_map.rs
+++ b/crates/editor/src/display_map/block_map.rs
@@ -1091,23 +1091,29 @@ impl BlockMap {
                 };
 
                 let rows_before_block;
-                match block_placement {
-                    BlockPlacement::Above(position) => {
-                        rows_before_block = position - new_transforms.summary().input_rows;
+                let input_rows = new_transforms.summary().input_rows;
+                match &block_placement {
+                    &BlockPlacement::Above(position) => {
+                        let Some(delta) = position.checked_sub(input_rows) else {
+                            continue;
+                        };
+                        rows_before_block = delta;
                         just_processed_folded_buffer = false;
                     }
-                    BlockPlacement::Near(position) | BlockPlacement::Below(position) => {
+                    &BlockPlacement::Near(position) | &BlockPlacement::Below(position) => {
                         if just_processed_folded_buffer {
                             continue;
                         }
-                        if position + RowDelta(1) < new_transforms.summary().input_rows {
+                        let Some(delta) = (position + RowDelta(1)).checked_sub(input_rows) else {
                             continue;
-                        }
-                        rows_before_block =
-                            (position + RowDelta(1)) - new_transforms.summary().input_rows;
+                        };
+                        rows_before_block = delta;
                     }
-                    BlockPlacement::Replace(ref range) => {
-                        rows_before_block = *range.start() - new_transforms.summary().input_rows;
+                    BlockPlacement::Replace(range) => {
+                        let Some(delta) = range.start().checked_sub(input_rows) else {
+                            continue;
+                        };
+                        rows_before_block = delta;
                         summary.input_rows = WrapRow(1) + (*range.end() - *range.start());
                         just_processed_folded_buffer = matches!(block, Block::FoldedBuffer { .. });
                     }
diff --git a/crates/editor/src/display_map/dimensions.rs b/crates/editor/src/display_map/dimensions.rs
index fd8efa6ca539d7eee8d59962ad7541d2bbc4fc4b..0bee934f8f87f1ad490cc74e60bb40bf86d8cdc8 100644
--- a/crates/editor/src/display_map/dimensions.rs
+++ b/crates/editor/src/display_map/dimensions.rs
@@ -41,6 +41,10 @@ macro_rules! impl_for_row_types {
             pub fn saturating_sub(self, other: $row_delta) -> $row {
                 $row(self.0.saturating_sub(other.0))
             }
+
+            pub fn checked_sub(self, other: $row) -> Option<$row_delta> {
+                self.0.checked_sub(other.0).map($row_delta)
+            }
         }
 
         impl ::std::ops::Add for $row {