500 Error caused by !="" check

Im getting an 500 Error when running this code:

    foreach($services as $service)
    {
        if(isset($service['value'] and $service['value']!=""))
        {
            echo $service['service']." = ".$service['value']."<br/>";
        }
    }

When i remove this part: and $service['value']!="" of the initial IF, The error is gone.
But i need this check to be sure im not inserting empty values into the Database.
I also tried the is_null() function but im still getting the error.
By the way, the Echo is just for debugging, it is not going to be in the finished code
I dont really know what is causing this Error... Maybe someone can help me here ;)

---

It is a matter of parentheses:

if(isset($service['value']) and ($service['value'] != ""))

You were trying to test isset of an AND condition, which cannot be done. You have to test isset() then test value.

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