Vigenere Cipher breaks when key has spaces

[u4pak]

If you attempt to decode a message from the Vigenere cipher that uses a key with spaces in it, the message will not decode properly.

Decoding Info:
Input: ZLLOM 6WJ+F
Key: Shady Is Cute
Output: HELLO 6DB+N
Expected Output: HELLO WORLD

[Adhiraj10]

Shouldn't the Expected Output be HELLO 6OR+D for the input ZLLOM 6WJ+F instead of HELLO WORLD?