Impossible to access an attribute ("username") on a NULL variable ("")

Question

Trying to display the username of the logged in user by putting

{{ app.user.username }}

in base.html.twig gives me an error like

Impossible to access an attribute ("username") on a NULL variable ("") in ::base.html.twig at line 45

Acessing it like

{{ app.security.getToken().getUser().getUsername() }}

results in the following error.

Impossible to invoke a method ("getUser") on a NULL variable ("")

How to acess the logged-in user's attributes globally in symfony? How to fix the error?

Victor Bocharsky · Accepted Answer · 2016-03-29 09:18:16Z

28

Try to check first if user exists, and then get its username:

{% if app.user %}
    {{ app.user.username }} 
{% endif %}

or do it with ternary operator:

{{ app.user ? app.user.username }}

You could use default Twig filter to set default value if username is empty:

 {{ app.user.username|default('undefined') }}

answered Jan 27, 2014 at 9:10

Victor Bocharsky

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2 Comments

yes..the problem is my 'app.user' is null.But my user is logged in as admin.How to figure out the issue?

Got it! The problem was the page i was refreshing to see the result was not behind the firewall.Thanks for your help.