.bashrcのエラーの直し方をおしえてください

ターミナルで

bash: /home/ec2-user/.bashrc: line 50: syntax error: unexpected end of file
bash-4.2$

と表示されていて調べてみたんですけど原因がわかりません。
どうしたら解決できるか教えていただけませんか？
よろしくお願いいします

# .bashrc

export PATH=$PATH:$HOME/.local/bin:$HOME/bin

# load nvm
export NVM_DIR="$HOME/.nvm"
[ "$BASH_VERSION" ] && npm() { 
    # hack: avoid slow npm sanity check in nvm
    if [ "$*" == "config get prefix" ]; then which node | sed "s/bin/node//"; 
    else $(which npm) "$@"; fi 
}
# [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm
rvm_silence_path_mismatch_check_flag=1 # prevent rvm complaints that nvm is first in PATH
unset npm # end hack


# User specific aliases and functions
alias python=python27

# modifications needed only in interactive mode
if [ "$PS1" != "" ]; then
    # Set default editor for git
    git config --global core.editor /usr/bin/nano

    # Turn on checkwinsize
    shopt -s checkwinsize

    # keep more history
    shopt -s histappend
    export HISTSIZE=100000
    export HISTFILESIZE=100000
    export PROMPT_COMMAND="history -a;"

    # Source for Git PS1 function
    if ! type -t __git_ps1 && [ -e "/usr/share/git-core/contrib/completion/git-prompt.sh" ]; then
        . /usr/share/git-core/contrib/completion/git-prompt.sh
    fi

    # Cloud9 default prompt
    _cloud9_prompt_user() {
        if [ "$C9_USER" = root ]; then
            echo "$USER"
        else
            echo "$C9_USER"
        fi
    }

    PS1='[\033[01;32m]$(_cloud9_prompt_user)[\033[00m]:[\033[01;34m]\w[\033[00m]$(__git_ps1 " (%s)" 2>/dev/null) $ '
source $HOME/.profile > /dev/null