Primefaces application stops working when click button - primefaces

Question

Hello please help with the following problem
At times the network is slow and my application programmed in java with primefaces 6.0 and glassfish 3.1 stops working
When I open the page it is shown and the values of the components are load a few seconds late, when clicking on a button when the values of the whole page are not loaded, an error is presented and the application stops working.
Example:
1)The screen is presented and the values of the p: selectOneMenu are not loaded
2)When clicking on the first button, shows the following error:
Javascript error:
Error de lectura XML: sección CDATA no cerrada Ubicación: http://localhost:8080/....pag1.xhtml Número de línea 2, columna 43: ....pag1.xhtml:2:43
Error de lectura XML: sección CDATA no cerrada Ubicación: http://localhost:8080/....pag1 Número de línea 2, columna 43: ....pag1.xhtml:2:43
TypeError: PF(...) is undefined
Java error:
Grave: JSF1073: se ha interceptado javax.faces.event.AbortProcessingException durante el procesamiento de RENDER_RESPONSE 6 : UIComponent-ClientId=, Mensaje=java.lang.NullPointerException
Grave: java.lang.NullPointerException
javax.faces.event.AbortProcessingException: java.lang.NullPointerException
at org.primefaces.context.PrimePartialResponseWriter.startMetadataIfNecessary(PrimePartialResponseWriter.java:303)
3)Seconds later load the values of p: selectOneMenu but the application stopped working due to the previous error.
Now if I open the screen and wait until the values of p: selectOneMenu are loaded, the screen works correctly
How can i fix this