diff --git a/pubchempy.py b/pubchempy.py
index 33012ae..b7b8da1 100644
--- a/pubchempy.py
+++ b/pubchempy.py
@@ -1983,9 +1983,10 @@ def project_category(self) -> ProjectCategory | None:
     def comments(self) -> list[str]:
         """Comments and additional information."""
         return [
-            comment for comment in self.record["assay"]["descr"]["comment"] if comment
+            comment for comment in self.record["assay"]["descr"].get("comment", "") if comment
         ]
 
+
     @property
     def results(self) -> list[dict[str, t.Any]]:
         """A list of dictionaries containing details of the results from this Assay."""