Undefined index btc when running watchdog

[haikalfouzi]

I got this error of undefined index when running simulation of watchdog function

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[i] Currently watching 1 transactions                                                                                   
[i] Buy price: 79.37 USD                                                                                                
[i] Sell price: 77.67 USD                                                                                               
[i] Spot price: 78.6 USD                                                                                                
[i] Difference buy/sell: 1.7 USD                                                                                        
                                                                                                                        
PHP Notice:  Undefined index: btc in /home/pi/Development/phptrader/trader.php on line 435                              
 [#1] Watching BUY order for    160 USD. Will buy when ETH price reaches 78.                                            
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[geek-at]

It's just a notice since I didn't initialize the variables. No biggy ;D