diff --git a/types/error.go b/types/error.go
index 72f26ff30..77a56dd25 100644
--- a/types/error.go
+++ b/types/error.go
@@ -160,6 +160,9 @@ func (e *NewAPIError) ToOpenAIError() OpenAIError {
 	if e.errorCode != ErrorCodeCountTokenFailed {
 		result.Message = common.MaskSensitiveInfo(result.Message)
 	}
+	if result.Message == "" {
+		result.Message = string(e.errorType)
+	}
 	return result
 }
 
@@ -186,6 +189,9 @@ func (e *NewAPIError) ToClaudeError() ClaudeError {
 	if e.errorCode != ErrorCodeCountTokenFailed {
 		result.Message = common.MaskSensitiveInfo(result.Message)
 	}
+	if result.Message == "" {
+		result.Message = string(e.errorType)
+	}
 	return result
 }