diff --git a/check_systemd_timer.py b/check_systemd_timer.py
index 52a64ab..0c64043 100755
--- a/check_systemd_timer.py
+++ b/check_systemd_timer.py
@@ -18,12 +18,12 @@ from checker.result import quit_check
 sys.path.insert(0, "/usr/lib/python3/dist-packages")
 import dbus
 
-SYSTEMCTL_STATUS_RE = r'Loaded:\s.*\.timer;\s(.*?);.*?\)\s*Active:\s(.*?) since.*?\s*Trigger:\s(.*?);'
+SYSTEMCTL_STATUS_RE = r'Loaded:\s.*\.timer;\s(.*?);.*?\)\s*Active:\s(.*?) since.*?\s*Trigger:\s(.*?;|n\/a)'
 
 
 class TimerInfo(BaseModel):
-    next: datetime
-    time_left: timedelta
+    next: Union[datetime, None]
+    time_left: Union[timedelta, None]
     last: Union[datetime, None]
     since_last: Union[timedelta, None]
     unit: str
@@ -49,18 +49,24 @@ def get_last_trigger(timer_name: str):
 
 
 def get_next_elapse(timer_name: str) -> Tuple[TimerInfo | None, None | str]:
+    now = datetime.now()
     try:
         output = subprocess.check_output(["systemctl", "status", timer_name], universal_newlines=True)
         if timer_name in output.split('\n')[0]:
             try:
                 parts = re.search(SYSTEMCTL_STATUS_RE, output)
 
-                next_trigger = parse(parts.group(3))
-                now = datetime.now(tz=next_trigger.tzinfo)
-                time_left = next_trigger - now
+                next_trigger_str = parts.group(3)
+                if next_trigger_str.lower() != 'n/a':
+                    next_trigger = parse(next_trigger_str)
+                    time_left = next_trigger - now.replace(tzinfo=next_trigger.tzinfo)
+                else:
+                    next_trigger = None
+                    time_left = None
+
                 last_trigger = get_last_trigger(timer_name)
                 if last_trigger is not None:
-                    since_last = now - last_trigger
+                    since_last = now.replace(tzinfo=last_trigger.tzinfo) - last_trigger
                 else:
                     since_last = None
 
@@ -104,18 +110,18 @@ def check_timer(timer_name: str, expected_interval: int = None):
             # if (next_elapse.left is not None and next_elapse.passed is not None) 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)
 
-            next_elapse_human = next_elapse.next.replace(tzinfo=tz.tzlocal()).strftime('%a %Y-%m-%d %H:%M %Z')
-            remaining_time_human = humanfriendly.format_timespan(next_elapse.time_left)
+            next_elapse_human = next_elapse.next.replace(tzinfo=tz.tzlocal()).strftime('%a %Y-%m-%d %H:%M %Z') if next_elapse.next else 'N/A'
+            remaining_time_human = humanfriendly.format_timespan(next_elapse.time_left) if next_elapse.time_left else 'N/A'
             since_last_human = humanfriendly.format_timespan(next_elapse.since_last) if next_elapse.since_last else 'N/A'
 
             perfdata_dict = {
                 'remaining_time': {
-                    'value': next_elapse.time_left.seconds,
+                    'value': next_elapse.time_left.seconds if next_elapse.time_left else 0,
                     'unit': 's',
                     'min': 0
                 },
                 'time_since_last': {
-                    'value': next_elapse.since_last.seconds if next_elapse.since_last is not None else 0,
+                    'value': next_elapse.since_last.seconds if next_elapse.since_last else 0,
                     'unit': 's',
                     'min': 0
                 }