diff --git a/src/azure-cli/azure/cli/command_modules/vm/custom.py b/src/azure-cli/azure/cli/command_modules/vm/custom.py
index be8746d473b..ef267eece94 100644
--- a/src/azure-cli/azure/cli/command_modules/vm/custom.py
+++ b/src/azure-cli/azure/cli/command_modules/vm/custom.py
@@ -3273,7 +3273,14 @@ def create_image_version(cmd, resource_group_name, gallery_name, gallery_image_n
         cred, _, _ = profile.get_login_credentials(resource=resource,
                                                    aux_subscriptions=aux_subscriptions)
         _, _, _, external_tokens = cred.get_all_tokens('https://management.azure.com/.default')
-        external_bearer_token = external_tokens[0][0] + ' ' + external_tokens[0][1]
+        if external_tokens:
+            external_token = external_tokens[0]
+            if len(external_token) >= 2:
+                external_bearer_token = external_token[0] + ' ' + external_token[1]
+            else:
+                logger.warning('Getting external tokens failed.')
+        else:
+            logger.warning('Getting external tokens failed.')
 
     location = location or _get_resource_group_location(cmd.cli_ctx, resource_group_name)
     end_of_life_date = fix_gallery_image_date_info(end_of_life_date)