Fehler: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 4

private void OpenDB(){
		MySqlHelper myDbHelper = new MySqlHelper(this);
		try {			
			myDbHelper.openDataBase();
			Cursor c = myDbHelper.sqlBefehl("1020");
			
			 /* Get the indices of the Columns we will need */
            int strasseColumn = c.getColumnIndex("Strasse");
            int versicherungColumn = c.getColumnIndex("Versicherung");
            int Ccount=0;
            /* Check if our result was valid. */
            if (c != null)          	
            		Ccount = c.getCount();
                    for(int x = 0; x <= Ccount; x++) {                 
                                    /* Retrieve the values of the Entry
                                     * the Cursor is pointing to. */
                             String strassenName = c.getString(strasseColumn); //HIER ENTSTEHT DER FEHLER !!!
                             String versicherungName = c.getString(versicherungColumn);
                                   
                                    /* Add current Entry to results. */
                             results.add(strassenName +" (" + versicherungName + ")");
                            }
                    }catch (Error e){
                    	throw new Error("Fehler in OpenDB");
                    }
            }