Check for error type

api_responses/api_responses.go

@@ -274,8 +274,13 @@ func GenericJSONResponseWithMessage(code int, err error) events.APIGatewayProxyR
 	var body map[string]string
 
 	if err != nil {
-		customErr := err.(*errors.CustomError)
+		var message string
+		if customErr, ok := err.(*errors.CustomError); ok {
 			message = customErr.Formatted(errors.FormattingOptions{NewLines: false, Causes: true})
+		} else {
+			message = err.Error()
+		}
+
 		body = map[string]string{
 			"message": string_utils.Capitalize(message),
 		}