2 files changed, 3 insertions, 3 deletions
diff --git a/js/runtime.ts b/js/runtime.ts
index d234cdd85..c439fb963 100644
--- a/js/runtime.ts
+++ b/js/runtime.ts
@@ -36,7 +36,7 @@ window.onerror = (
   // Error.prepareStackTrace handler. Users will get unmapped stack traces on
   // uncaught exceptions until this issue is fixed.
   //Error.prepareStackTrace = null;
-  console.log(error.message, error.stack);
+  console.log(error.stack);
   os.exit(1);
 };
 
diff --git a/js/util.ts b/js/util.ts
index 7216f9491..05b243427 100644
--- a/js/util.ts
+++ b/js/util.ts
@@ -15,9 +15,9 @@ export function log(...args: any[]): void {
   }
 }
 
-export function assert(cond: boolean, msg = "") {
+export function assert(cond: boolean, msg = "assert") {
   if (!cond) {
-    throw Error(`Assert fail. ${msg}`);
+    throw Error(msg);
   }
 }