fix: do not fail when extend error with snippet

Author: DudaGod

lib/common-utils.ts

@@ -331,7 +331,7 @@ const cloneError = <T extends Error>(error: T): T => {
 };
 
 export const mergeSnippetIntoErrorStack = <T extends Error>(error: T & { snippet?: string }): T => {
-    if (!error.snippet) {
+    if (!error || !error.snippet) {
         return error;
     }