Errors in Forum Error Log

[lelele]

Sorry,
Not quite sure what they mean and how to fix them, so would appreciate any guidance:

8: Undefined index: newtitle
File: /home/.filofax/febchick/febchicks.com/forum/Sources/shop/items/ChangeOtherTitle.php
Line: 38

8: Undefined index: username
File: /home/.filofax/febchick/febchicks.com/forum/Sources/shop/items/ChangeOtherTitle.php
Line: 36

8: Undefined index: newtitle
File: /home/.filofax/febchick/febchicks.com/forum/Sources/shop/items/ChangeOtherTitle.php
Line: 35

8: Undefined index: username
File: /home/.filofax/febchick/febchicks.com/forum/Sources/shop/items/ChangeOtherTitle.php
Line: 38

8: Undefined index: member
File: /home/.filofax/febchick/febchicks.com/forum/Sources/shop/Shop.php
Line: 710

8: Undefined index: member
File: /home/.filofax/febchick/febchicks.com/forum/Sources/shop/Shop.php
Line: 714

8: Undefined index: member
File: /home/.filofax/febchick/febchicks.com/forum/Sources/shop/Shop.php
Line: 722

[Daniel15]

This sounds like someone tried to user the "Change Someone Else's Title" item, but didn't  type anything into the input boxes