adding

app/Commands/LetsEncryptRemoveCommand.php

@@ -52,11 +52,16 @@ class LetsEncryptRemoveCommand extends Command
             $errors = 0;
 
             foreach($directories as $key => $directory) {
+
+                if ($key === 'renewal') {
+                    $directory .= $directory.'.conf';
+                }
+
                 if (!file_exists($directory)) {
                     $errors++;
                 } else {
-                    if ($key === 'renewal') {
-                        exec('rm '.$directory.'.conf 2>&1', $output);
+                    if (is_file($directory)) {
+                        exec('rm '.$directory.' 2>&1', $output);
                     } else {
                         exec('rm -rf '.$directory.' 2>&1', $output);
                     }