diff --git a/Services/client/src/stores/file-info-data.ts b/Services/client/src/stores/file-info-data.ts
index 4ccac65..0395b98 100644
--- a/Services/client/src/stores/file-info-data.ts
+++ b/Services/client/src/stores/file-info-data.ts
@@ -130,7 +130,9 @@ export const useFileInfoStore = defineStore('info', () => {
     if (mimeType === undefined) {
       return 'unknown type'
     }
-    return mimeFileMapping[mimeType].type
+    if (mimeFileMapping.hasOwnProperty(mimeType)) {
+      return mimeFileMapping[mimeType].type
+    }
   }
 
   function getFormatDate(dateTime: string | undefined): string {