diff --git a/src/core/components/errors.jsx b/src/core/components/errors.jsx
index c72dd2fd..c3d6cf93 100644
--- a/src/core/components/errors.jsx
+++ b/src/core/components/errors.jsx
@@ -113,7 +113,7 @@ const SpecErrorItem = ( { error, jumpToLine } ) => {
   }
 
 function toTitleCase(str) {
-  return str
+  return (str || "")
     .split(" ")
     .map(substr => substr[0].toUpperCase() + substr.slice(1))
     .join(" ")