diff --git a/src/frontend/src/hooks/files/use-upload-file.ts b/src/frontend/src/hooks/files/use-upload-file.ts
index 03012f5fd..b347832c8 100644
--- a/src/frontend/src/hooks/files/use-upload-file.ts
+++ b/src/frontend/src/hooks/files/use-upload-file.ts
@@ -38,12 +38,10 @@ const useUploadFile = ({
       for (const file of filesToUpload) {
         validateFileSize(file);
         // Check if file extension is allowed
-        const fileExtension = file.type
-          ? file.name.split(".").pop()?.toLowerCase()
-          : null;
-        if (types && (!fileExtension || !types.includes(fileExtension))) {
+        const fileExtension = file.name.split(".").pop()?.toLowerCase();
+        if (!fileExtension || (types && !types.includes(fileExtension))) {
           throw new Error(
-            `File type not allowed. Allowed types: ${types.join(", ")}`,
+            `File type ${fileExtension} not allowed. Allowed types: ${types?.join(", ")}`,
           );
         }
         if (!fileExtension) {