fix(init): fix `division by 0` error (#10213)

Fixes #10213

oh-my-zsh.sh

@@ -14,7 +14,7 @@ fi
 
 # Create cache and completions dir and add to $fpath
 mkdir -p "$ZSH_CACHE_DIR/completions"
-(( ${fpath[(Ie)$ZSH_CACHE_DIR/completions]} )) || fpath=("$ZSH_CACHE_DIR/completions" $fpath)
+(( ${fpath[(Ie)"$ZSH_CACHE_DIR/completions"]} )) || fpath=("$ZSH_CACHE_DIR/completions" $fpath)
 
 # Check for updates on initial load...
 if [ "$DISABLE_AUTO_UPDATE" != "true" ]; then