If the variable comes from another script, check the script is 'include'd or 'require'd at least once;
Did you really define/set the Array element?
Did you unset the Array element somewhere before?
bored@Work:~#joke
The first string says, “I think I’ll have a beer quag fulk boorg jdk^CjfdLk jk3s d#f67howe%^U r89nvy~~owmc63^Dz x.xvcu”, “Please excuse my friend,” the second string says, “He isn’t null-terminated.”
Error 
Retry