diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index 3fe12549f9..1fbecfa48b 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -186,7 +186,7 @@ export function makeWaitForNextTask() {
 
 export function assert(value: any, message?: string): asserts value {
   if (!value)
-    throw new Error(message);
+    throw new Error(message || 'Assertion error');
 }
 
 export function debugAssert(value: any, message?: string): asserts value {