diff --git a/crates/language_tools/src/lsp_button.rs b/crates/language_tools/src/lsp_button.rs
index 1589947d9e72e11c6be3ff98c1fb65b06260a085..54aae61a696672b5767e05f3cc85aba57d4d3e41 100644
--- a/crates/language_tools/src/lsp_button.rs
+++ b/crates/language_tools/src/lsp_button.rs
@@ -125,7 +125,11 @@ impl ProcessMemoryCache {
 
     fn is_descendant_of(&self, pid: Pid, root_pid: Pid, parent_map: &HashMap<Pid, Pid>) -> bool {
         let mut current = pid;
+        let mut visited = HashSet::default();
         while current != root_pid {
+            if !visited.insert(current) {
+                return false;
+            }
             match parent_map.get(&current) {
                 Some(&parent) => current = parent,
                 None => return false,