diff --git a/lib/workers/repository/dependency-dashboard.ts b/lib/workers/repository/dependency-dashboard.ts
index dfd9119169454c..b2472049441161 100644
--- a/lib/workers/repository/dependency-dashboard.ts
+++ b/lib/workers/repository/dependency-dashboard.ts
@@ -168,7 +168,10 @@ function appendRepoProblems(config: RenovateConfig, issueBody: string): string {
       )
   );
   if (repoProblems.size) {
-    logger.debug({ repoProblems }, 'repository problems');
+    logger.debug(
+      { repoProblems: Array.from(repoProblems) },
+      'repository problems'
+    );
     newIssueBody += '## Repository problems\n\n';
     newIssueBody +=
       'These problems occurred while renovating this repository.\n\n';