diff --git a/vdb/lib/__init__.py b/vdb/lib/__init__.py
index 612f424..43a9307 100644
--- a/vdb/lib/__init__.py
+++ b/vdb/lib/__init__.py
@@ -613,8 +613,8 @@ def to_dict(self):
             "type": self.type,
             "severity": str(self.severity),
             "cvss_score": str(self.cvss_score),
-            "cvss_v3": self.cvss_v3.to_dict() if self.cvss_v3 else "",
-            "package_issue": self.package_issue.to_dict(),
+            "cvss_v3": self.cvss_v3.to_dict() if self.cvss_v3 else {},
+            "package_issue": self.package_issue.to_dict() if self.package_issue else {},
             "short_description": self.short_description,
             "long_description": self.long_description,
             "related_urls": self.related_urls,