Update

app/Http/Controllers/UserExportController.php

@@ -62,7 +62,7 @@ public function premiumExportComplete(Request $request)
             ->where('user_id', $user->id)
             ->first();
 
-        if (!$token) {
+        if (! $token) {
             return response()->json([
                 'error' => [
                     'message' => 'Invalid export token.',
@@ -70,7 +70,7 @@ public function premiumExportComplete(Request $request)
             ]);
         }
 
-        if (!$token->isValid()) {
+        if (! $token->isValid()) {
             return response()->json([
                 'error' => [
                     'message' => 'Export token has expired or already been used.',