diff --git a/auth/lib/core/configuration.dart b/auth/lib/core/configuration.dart
index 586a519b65..123b8f37c0 100644
--- a/auth/lib/core/configuration.dart
+++ b/auth/lib/core/configuration.dart
@@ -285,9 +285,20 @@ class Configuration {
   Future<void> recover(String recoveryKey) async {
     // check if user has entered mnemonic code
     if (recoveryKey.contains(' ')) {
-      if (recoveryKey.split(' ').length != mnemonicKeyWordCount) {
+      final split = recoveryKey.split(' ');
+      if (split.length != mnemonicKeyWordCount) {
+        String wordThatIsFollowedByEmptySpaceInSplit = '';
+        for (int i = 1; i < split.length; i++) {
+          String word = split[i];
+          if (word.isEmpty) {
+            wordThatIsFollowedByEmptySpaceInSplit =
+                '\n\nExtra space after word "${split[i - 1]}"';
+            break;
+          }
+        }
         throw AssertionError(
-          'recovery code should have $mnemonicKeyWordCount words',
+          '\nRecovery code should have $mnemonicKeyWordCount words, '
+          'found ${split.length} words instead.$wordThatIsFollowedByEmptySpaceInSplit',
         );
       }
       recoveryKey = bip39.mnemonicToEntropy(recoveryKey);