Merge pull request #1639 from jtpereyda/exception-handler-crash-fix

fix #1638

Author: gracekarina

modules/swagger-parser-v3/src/main/java/io/swagger/v3/parser/OpenAPIV3Parser.java

@@ -206,7 +206,7 @@ private String getParseErrorMessage(String originalMessage, String location) {
             return String.format("Unable to parse `%s`", location);
         }
         if (originalMessage.startsWith("Duplicate field")) {
-            return String.format(originalMessage + " in `%s`", location);
+            return String.format("%s in `%s`", originalMessage, location);
         }
         return originalMessage;
     }