diff --git a/ucelofka-data/src/invoice/v1.rs b/ucelofka-data/src/invoice/v1.rs
index bc23d69..f8e7e4a 100644
--- a/ucelofka-data/src/invoice/v1.rs
+++ b/ucelofka-data/src/invoice/v1.rs
@@ -87,7 +87,7 @@ impl Invoice {
             _version: VERSION,
             id: new_id,
             issue_day: Utc::now().format("%Y-%m-%d").to_string(),
-            due_day: (Utc::now() + Duration::days(DEFAULT_DUE))
+            due_day: (Utc::now() + Duration::try_days(DEFAULT_DUE).unwrap_or_default())
                 .format("%Y-%m-%d")
                 .to_string(),
             issuer: Issuer {
diff --git a/ucelofka-data/src/invoice/v2.rs b/ucelofka-data/src/invoice/v2.rs
index 67ce236..04060c5 100644
--- a/ucelofka-data/src/invoice/v2.rs
+++ b/ucelofka-data/src/invoice/v2.rs
@@ -112,10 +112,11 @@ impl Invoice {
             id: new_id,
             issue_date: Utc::now().format("%Y-%m-%d").to_string(),
             due_date: (Utc::now()
-                + Duration::days(
+                + Duration::try_days(
                     due.map(|v| i64::try_from(v).unwrap())
                         .unwrap_or(DEFAULT_DUE),
-                ))
+                )
+                .unwrap_or_default())
             .format("%Y-%m-%d")
             .to_string(),
             issuer: Issuer {