Although I never found out what caused the problem, I "guarded" my code 
like this:

if(isOnline()) {
    // dangerous code here
    ...
} else {
    // handle showing a message
    ...
}

and this is the isOnline method:

 private boolean isOnline() {

     ConnectivityManager cm = (ConnectivityManager) 
getSystemService(Context.CONNECTIVITY_SERVICE);

    return cm.getActiveNetworkInfo() == null ? false : 
cm.getActiveNetworkInfo().isConnected();

}

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