diff --git a/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/profile/AlarmRuleState.java b/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/profile/AlarmRuleState.java
index 724b10c269..c5ad4607b2 100644
--- a/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/profile/AlarmRuleState.java
+++ b/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/profile/AlarmRuleState.java
@@ -140,26 +140,30 @@ class AlarmRuleState {
             case ANY_TIME:
                 return true;
             case SPECIFIC_TIME: {
-                SpecificTimeSchedule originalSchedule = (SpecificTimeSchedule) alarmRule.getSchedule();
-                EntityKeyValue dynamicValue = getDynamicValue(data, originalSchedule.getDynamicValue());
+                SpecificTimeSchedule defaultSchedule = (SpecificTimeSchedule) alarmRule.getSchedule();
+                EntityKeyValue dynamicValue = getDynamicValue(data, defaultSchedule.getDynamicValue());
 
-                if (dynamicValue != null) {
-                    SpecificTimeSchedule schedule = JsonConverter.parse(dynamicValue.getJsonValue(), SpecificTimeSchedule.class);
-                    originalSchedule = schedule == null ? originalSchedule : schedule;
+                SpecificTimeSchedule schedule;
+                try {
+                    schedule = JsonConverter.parse(dynamicValue.getJsonValue(), SpecificTimeSchedule.class);
+                } catch (Exception e) {
+                    schedule = defaultSchedule;
                 }
 
-                return isActiveSpecific(originalSchedule, eventTs);
+                return isActiveSpecific(schedule, eventTs);
             }
             case CUSTOM: {
-                CustomTimeSchedule originalSchedule = (CustomTimeSchedule) alarmRule.getSchedule();
-                EntityKeyValue dynamicValue = getDynamicValue(data, originalSchedule.getDynamicValue());
+                CustomTimeSchedule defaultSchedule = (CustomTimeSchedule) alarmRule.getSchedule();
+                EntityKeyValue dynamicValue = getDynamicValue(data, defaultSchedule.getDynamicValue());
 
-                if (dynamicValue != null) {
-                    CustomTimeSchedule schedule = JsonConverter.parse(dynamicValue.getJsonValue(), CustomTimeSchedule.class);
-                    originalSchedule = schedule == null ? originalSchedule : schedule;
+                CustomTimeSchedule schedule;
+                try {
+                    schedule = JsonConverter.parse(dynamicValue.getJsonValue(), CustomTimeSchedule.class);
+                } catch (Exception e) {
+                    schedule = defaultSchedule;
                 }
 
-                return isActiveCustom(originalSchedule, eventTs);
+                return isActiveCustom(schedule, eventTs);
             }
             default:
                 throw new RuntimeException("Unsupported schedule type: " + alarmRule.getSchedule().getType());
diff --git a/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/profile/ProfileState.java b/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/profile/ProfileState.java
index 6d3c48892c..c8751d65f7 100644
--- a/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/profile/ProfileState.java
+++ b/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/profile/ProfileState.java
@@ -80,7 +80,10 @@ class ProfileState {
                         addDynamicValuesRecursively(keyFilter.getPredicate(), entityKeys, ruleKeys);
                     }
                     addEntityKeysFromAlarmConditionSpec(alarmRule);
-                    addScheduleDynamicValues(alarmRule.getSchedule());
+                    AlarmSchedule schedule = alarmRule.getSchedule();
+                    if (schedule != null) {
+                        addScheduleDynamicValues(schedule);
+                    }
                 }));
                 if (alarm.getClearRule() != null) {
                     var clearAlarmKeys = alarmClearKeys.computeIfAbsent(alarm.getId(), id -> new HashSet<>());
@@ -99,12 +102,13 @@ class ProfileState {
         DynamicValue<String> dynamicValue = null;
         switch (schedule.getType()) {
             case SPECIFIC_TIME:
-                SpecificTimeSchedule specSchedule = (SpecificTimeSchedule) schedule;
-                dynamicValue = specSchedule.getDynamicValue();
+                SpecificTimeSchedule specificTimeSchedule = (SpecificTimeSchedule) schedule;
+                dynamicValue = specificTimeSchedule.getDynamicValue();
                 break;
             case CUSTOM:
-                CustomTimeSchedule custSchedule = (CustomTimeSchedule) schedule;
-                dynamicValue = custSchedule.getDynamicValue();
+                CustomTimeSchedule customTimeSchedule = (CustomTimeSchedule) schedule;
+                dynamicValue = customTimeSchedule.getDynamicValue();
+                break;
         }
 
         if (dynamicValue != null) {