hacking: security in practice
Simple php webshell works on DVWA, but not on Mutillidae II ver 2.8.76

The following php webshell is working just fine on DVWA

However, when I tried it on Mutillidae II Version: 2.8.76, I'm getting the following error.
Warning: Undefined array key "cmd" in /tmp/webshell.php on line 1 Deprecated: system(): Passing null to parameter #1 ($command) of type string is deprecated in /tmp/webshell.php on line 1 Fatal error: Uncaught ValueError: system(): Argument #1 ($command) cannot be empty in /tmp/webshell.php:1 Stack trace: #0 /tmp/webshell.php(1): system('') #1 /var/www/mutillidae/index.php(516): require_once('/tmp/1-simple-w...') #2 {main} thrown in /tmp/webshell.php on line 1
What's wrong in this shell and why can't I use it on Mutillidae?

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