Linkedin sharing not working properly

Hi, I really love your plugin but I’ve noticed I have problems sharing some of my posts with my groups in Linkedin. When I hit the “Share” button, the form seems to do nothing. But I can see a POST 200 response with an error like that:

responseInfo>FORM_INVALID/responseInfo
  responseMsg&gt/responseMsg
  jsonPayLoad&gt/jsonPayLoad

     ;formErrors
        { globalError :
          inlineErrors: {

             messageSubject-shareForm' : El texto que has proporcionado es demasiado largo (la longitud máxima es de 150 caracteres; tu texto contiene 151 caracteres).
          }
        }
      ;/formErrors
;/WSResponse

The error it’s in Spanish but it says that my text is 151 characters long when the max. is 150 characters. But I’ve tried to cut the text to only 4 or 5 characters and I keep getting the same error.

Can you help with that? Is it a plugin issue or is it related with linkedin? I wouldn’t want to change to another plugin, this works perfect except for this.

Thanks a lot!

http://ww.wp.xz.cn/plugins/simple-share-buttons-adder/