diff --git a/crates/editor/src/editor.rs b/crates/editor/src/editor.rs
index 1a1bf7cc66..3ca5798af4 100644
--- a/crates/editor/src/editor.rs
+++ b/crates/editor/src/editor.rs
@@ -4992,6 +4992,11 @@ impl Editor {
         pending_selection: Option<PendingSelection>,
         cx: &mut ViewContext<Self>,
     ) {
+        assert!(
+            !selections.is_empty() || pending_selection.is_some(),
+            "must have at least one selection"
+        );
+
         let old_cursor_position = self.newest_anchor_selection().head();
 
         self.selections = selections;
diff --git a/crates/editor/src/multi_buffer.rs b/crates/editor/src/multi_buffer.rs
index fa35ad206b..c267ea775f 100644
--- a/crates/editor/src/multi_buffer.rs
+++ b/crates/editor/src/multi_buffer.rs
@@ -3357,7 +3357,7 @@ mod tests {
                 }
                 40..=44 if !anchors.is_empty() => {
                     let multibuffer = multibuffer.read(cx).read(cx);
-
+                    let prev_len = anchors.len();
                     anchors = multibuffer
                         .refresh_anchors(&anchors)
                         .into_iter()
@@ -3366,6 +3366,7 @@ mod tests {
 
                     // Ensure the newly-refreshed anchors point to a valid excerpt and don't
                     // overshoot its boundaries.
+                    assert_eq!(anchors.len(), prev_len);
                     let mut cursor = multibuffer.excerpts.cursor::<Option<&ExcerptId>>();
                     for anchor in &anchors {
                         if anchor.excerpt_id == ExcerptId::min()