diff --git a/Src/WitsmlExplorer.Frontend/components/DateFormatter.ts b/Src/WitsmlExplorer.Frontend/components/DateFormatter.ts
index b9466f36e..da8f7a1cb 100644
--- a/Src/WitsmlExplorer.Frontend/components/DateFormatter.ts
+++ b/Src/WitsmlExplorer.Frontend/components/DateFormatter.ts
@@ -55,7 +55,7 @@ export function getOffsetFromTimeZone(timeZone: TimeZone): string {
 }
 
 export function getOffset(dateString: string): string | null {
-  if (dateString.indexOf("Z") == dateString.length - 1) {
+  if (!dateString || dateString.indexOf("Z") == dateString.length - 1) {
     return "Z";
   }