diff --git a/check_systemd_timer.py b/check_systemd_timer.py
index f8ff3f1..6d12903 100755
--- a/check_systemd_timer.py
+++ b/check_systemd_timer.py
@@ -20,7 +20,7 @@ from datetime import datetime
 import humanfriendly
 
 SYSTEMCTL_TIMERS_RE = re.compile(
-    r'^([A-Za-z]*\s[0-9]{4}-[0-9]{2}-[0-9]{2}\s*[0-9]{2}:[0-9]{2}:[0-9]{2}\s[A-Z]*)\s*(([0-9]*[a-z]*\s)*left)\s*([A-Za-z]*\s[0-9]{4}-[0-9]{2}-[0-9]{2}\s[0-9]{2}:[0-9]{2}:[0-9]{2}\s[A-Z]*)\s*([0-9A-Za-z\s]*\sago)\s*([A-Za-z\-_]*.timer)\s*([A-Za-z\-_]*.service)')
+    r'^(([A-Za-z]*\s[0-9]{4}-[0-9]{2}-[0-9]{2}\s*[0-9]{2}:[0-9]{2}:[0-9]{2}\s[A-Z]*)|n\/a)\s*((([0-9]*[a-z]*\s)*left)|n\/a)\s*(([A-Za-z]*\s[0-9]{4}-[0-9]{2}-[0-9]{2}\s[0-9]{2}:[0-9]{2}:[0-9]{2}\s[A-Z]*)|n\/a)\s*(([0-9A-Za-z\s]*\sago)|n\/a)\s*([A-Za-z\-_]*.timer)\s*(([A-Za-z\-_]*.service)|\s*)')
 
 
 def get_next_elapse(timer_name):
@@ -31,26 +31,32 @@ def get_next_elapse(timer_name):
             if timer_name in line:
                 parts = re.search(SYSTEMCTL_TIMERS_RE, line)
 
-                try:
-                    datetime_object = datetime.strptime(parts.group(1), '%a %Y-%m-%d %H:%M:%S %Z')
-                except ValueError as e:
-                    return None, e
+                datetime_object = None
+                if parts.group(2):
+                    try:
+                        datetime_object = datetime.strptime(parts.group(2), '%a %Y-%m-%d %H:%M:%S %Z')
+                    except ValueError as e:
+                        return None, e
 
-                time_left = parse_systemctl_time_delta(parts.group(2))
-                if isinstance(time_left, humanfriendly.InvalidTimespan):
-                    return None, humanfriendly.InvalidTimespan
+                time_left = 'n/a'
+                if parts.group(4):
+                    time_left = parse_systemctl_time_delta(parts.group(4))
+                    if isinstance(time_left, humanfriendly.InvalidTimespan):
+                        return None, humanfriendly.InvalidTimespan
 
-                time_passed = parse_systemctl_time_delta(parts.group(5))
-                if isinstance(time_passed, humanfriendly.InvalidTimespan):
-                    return None, humanfriendly.InvalidTimespan
+                time_passed = 'n/a'
+                if parts.group(9):
+                    time_passed = parse_systemctl_time_delta(parts.group(9))
+                    if isinstance(time_passed, humanfriendly.InvalidTimespan):
+                        return None, humanfriendly.InvalidTimespan
 
                 timer_info = {
                     'next': datetime_object,
                     'left': time_left,
-                    'last': parts.group(4),
+                    'last': parts.group(7),
                     'passed': time_passed,
-                    'unit': parts.group(6),
-                    'activates': parts.group(7)
+                    'unit': parts.group(10),
+                    'activates': parts.group(12)
                 }
                 return timer_info, None
         return None, ValueError('Timer not found')
@@ -75,21 +81,32 @@ def check_timer(timer_name):
             if err:
                 quit_check(f'{err}', nagios.STATE_UNKNOWN)
 
-            if next_elapse['left'] < 0 or next_elapse['passed'] < 0:
+            if (next_elapse['left'] != 'n/a' and next_elapse['passed'] != 'n/a') and (next_elapse['left'] < 0 or next_elapse['passed'] < 0):
                 quit_check(f'Timer is negative??? Left: {next_elapse["left"]}. Passed: {next_elapse["passed"]}', nagios.STATE_UNKNOWN)
 
-            local_tz = tz.tzlocal()
-            next_elapse_str = next_elapse['next'].replace(tzinfo=local_tz).strftime('%a %Y-%m-%d %H:%M %Z')
-            remaining_time_human = humanfriendly.format_timespan(next_elapse['left'])
-            passed_time_human = humanfriendly.format_timespan(next_elapse['passed'])
+            if next_elapse['next']:
+                local_tz = tz.tzlocal()
+                next_elapse_str = next_elapse['next'].replace(tzinfo=local_tz).strftime('%a %Y-%m-%d %H:%M %Z')
+            else:
+                next_elapse_str = 'n/a'
+
+            if next_elapse['left'] != 'n/a':
+                remaining_time_human = humanfriendly.format_timespan(next_elapse['left'])
+            else:
+                remaining_time_human = 'n/a'
+            if next_elapse['passed'] != 'n/a':
+                passed_time_human = humanfriendly.format_timespan(next_elapse['passed'])
+            else:
+                passed_time_human = 'n/a'
+
             perfdata_dict = {
                 'remaining_time': {
-                    'value': int(next_elapse['left']),
+                    'value': int(next_elapse['left']) if next_elapse['left'] != 'n/a' else -1,
                     'unit': 's',
                     'min': 0
                 },
                 'passed_time': {
-                    'value': int(next_elapse['passed']),
+                    'value': int(next_elapse['passed']) if next_elapse['passed'] != 'n/a' else -1,
                     'unit': 's',
                     'min': 0
                 }