diff --git a/backend/src/main/java/org/ftclub/cabinet/auth/service/FtApiManager.java b/backend/src/main/java/org/ftclub/cabinet/auth/service/FtApiManager.java
index fc89d5bd6..99456454a 100644
--- a/backend/src/main/java/org/ftclub/cabinet/auth/service/FtApiManager.java
+++ b/backend/src/main/java/org/ftclub/cabinet/auth/service/FtApiManager.java
@@ -46,10 +46,12 @@ public void issueAccessToken() {
 								return objectMapper.readTree(response)
 										.get(ftApiProperties.getAccessTokenName()).asText();
 							} catch (Exception e) {
-								throw new RuntimeException();
+								log.error("mapping error {}",e.getMessage());
+								throw new ServiceException(ExceptionStatus.EXTERNAL_API_EXCEPTION);
 							}
 						})
 						.onErrorResume(e -> {
+							log.error("ErrorResumed {}",e.getMessage());
 							throw new ServiceException(ExceptionStatus.OAUTH_BAD_GATEWAY);
 						})
 						.block();