1 files changed, 8 insertions, 1 deletions
diff --git a/core/01_core.js b/core/01_core.js
index 02150674e..2560f979d 100644
--- a/core/01_core.js
+++ b/core/01_core.js
@@ -129,7 +129,14 @@
   }
 
   function buildCustomError(className, message, code) {
-    const error = errorMap[className]?.(message);
+    let error;
+    try {
+      error = errorMap[className]?.(message);
+    } catch (e) {
+      throw new Error(
+        `Unsable to build custom error for "${className}"\n  ${e.message}`,
+      );
+    }
     // Strip buildCustomError() calls from stack trace
     if (typeof error == "object") {
       ErrorCaptureStackTrace(error, buildCustomError);