diff --git a/libs/event-emitter/src/redmine-data-loader/redmine-data-loader.ts b/libs/event-emitter/src/redmine-data-loader/redmine-data-loader.ts
index 2ebe001..320001b 100644
--- a/libs/event-emitter/src/redmine-data-loader/redmine-data-loader.ts
+++ b/libs/event-emitter/src/redmine-data-loader/redmine-data-loader.ts
@@ -31,6 +31,9 @@ export class RedmineDataLoader {
     issueNumber: number,
     skipEnhancers = false,
   ): Promise<RedmineTypes.Issue | null> {
+    if (issueNumber <= 0) {
+      return null;
+    }
     const url = this.getIssueUrl(issueNumber);
     let resp;
     try {