diff --git a/grid_recorder.py b/grid_recorder.py
index 9bd67e5..0eca760 100644
--- a/grid_recorder.py
+++ b/grid_recorder.py
@@ -33,7 +33,7 @@ class Configuration():
 
         # timestamps
         self.now = datetime.datetime.now()
-        self.start_clock = None
+        self.start_clock = [datetime.datetime.now().hour, datetime.datetime.now().minute]
         self.end_clock = None
 
         # paths
@@ -90,9 +90,11 @@ class Configuration():
                 self.gain = int(line.split(':')[1].strip())
             # ToDo: add option to start now !!!
             elif 'StartTime' in line:
-                self.start_clock = np.array(line.strip().replace(' ', '').split(':')[1:], dtype=int)
+                if len(np.array(line.strip().replace(' ', '').split(':')[1:])) > 1:
+                    self.start_clock = np.array(line.strip().replace(' ', '').split(':')[1:], dtype=int)
             elif 'EndTime' in line:
-                self.end_clock = np.array(line.strip().replace(' ', '').split(':')[1:], dtype=int)
+                if len(np.array(line.strip().replace(' ', '').split(':')[1:])) > 1:
+                    self.end_clock = np.array(line.strip().replace(' ', '').split(':')[1:], dtype=int)
             elif 'Gain' in line:
                 self.gain = int(line.split(':')[1].strip())
         self.channels = self.n_rows * self.n_cols + self.n_extra
@@ -262,6 +264,7 @@ class Recorder():
         self.record()
 
     def record(self):
+
         while True:
             if datetime.datetime.now().hour == self.config.start_clock[0] and datetime.datetime.now().minute == self.config.start_clock[1]:
                 break
@@ -377,11 +380,12 @@ class Recorder():
 
             else:
                 (np.array(data[last_idx:], dtype=np.float32) / self.config.gain).tofile(self.f)
-                if datetime.datetime.now().hour * 60 + datetime.datetime.now().minute >= self.config.end_clock[0] * 60 + self.config.end_clock[1]:
-                    self.f.flush()
-                    GPIO.output(self.LED1_pin, GPIO.LOW)
-                    GPIO.output(self.LED_out_pin, GPIO.LOW)
-                    break
+                if hasattr(self.config.end_clock, '__len__'):
+                    if datetime.datetime.now().hour * 60 + datetime.datetime.now().minute >= self.config.end_clock[0] * 60 + self.config.end_clock[1]:
+                        self.f.flush()
+                        GPIO.output(self.LED1_pin, GPIO.LOW)
+                        GPIO.output(self.LED_out_pin, GPIO.LOW)
+                        break
 
                 (np.array(data[:index], dtype=np.float32) / self.config.gain).tofile(self.f)
                 self.f.flush()