Automator workflow "run shell script" keeps running. How to stop?

Because i want two instances of dropbox running simultaneously on my Mac, I set up a small automator workflow application. The workflow consist of a simple shell script:
Or in text:
bash
HOME=$HOME/Dropbox-quivertree /Applications/Dropbox.app/Contents/MacOS/Dropbox &
The problem is that once the application runs, or i execute the script from within automator, it just keeps running (i get the little cog in my menubar). Anybody have an idea how to automatically stop after it has launched dropbox?
Thanks!
Kim

I do not have dropbox on my computer, so I tested using the Calculator application. The solution proposed by Mattis S.F. does work, but his explanation does not hold true in my case. Initially, I successfully tried
HOME=$HOME/Dropbox-quivertree nohup /Applications/Calculator.app/Contents/MacOS/Calculator >/dev/null 2>&1 &
If I remove the “nohup”, the result does not change. Removal of the “/dev/null 2>&1”, however, results in the same problem originally described by Kim van der Leeuw. My guess is the background process has stdout and stderr redirected by default back to the automator. When redirected to /dev/null, the automator no longer waits for the background process to complete. To summarize, change
HOME=$HOME/Dropbox-quivertree /Applications/Dropbox.app/Contents/MacOS/Dropbox &
to
HOME=$HOME/Dropbox-quivertree /Applications/Dropbox.app/Contents/MacOS/Dropbox >/dev/null 2>&1 &

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<pre class="jive-pre" style="white-space:pre-wrap;width:585px;">
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