diff --git a/api/chalicelib/core/errors.py b/api/chalicelib/core/errors.py
index c1f5633de..a7f863e79 100644
--- a/api/chalicelib/core/errors.py
+++ b/api/chalicelib/core/errors.py
@@ -418,9 +418,9 @@ def __get_basic_constraints(platform=None, time_constraint=True, startTime_arg_n
 
 def __get_sort_key(key):
     return {
-        "datetime": "max_datetime",
-        "lastOccurrence": "max_datetime",
-        "firstOccurrence": "min_datetime"
+        schemas.ErrorSort.occurrence: "max_datetime",
+        schemas.ErrorSort.users_count: "users",
+        schemas.ErrorSort.sessions_count: "sessions"
     }.get(key, 'max_datetime')
 
 
diff --git a/api/schemas.py b/api/schemas.py
index 1d0e18dfb..3b4fefbd6 100644
--- a/api/schemas.py
+++ b/api/schemas.py
@@ -600,7 +600,7 @@ class SessionsSearchPayloadSchema(BaseModel):
     startDate: int = Field(None)
     endDate: int = Field(None)
     sort: str = Field(default="startTs")
-    order: str = Field(default="DESC")
+    order: Literal["asc", "desc"] = Field(default="desc")
     events_order: Optional[SearchEventOrder] = Field(default=SearchEventOrder._then)
     group_by_user: bool = Field(default=False)
     limit: int = Field(default=200, gt=0, le=200)
@@ -697,7 +697,14 @@ class ErrorStatus(str, Enum):
     ignored = 'ignored'
 
 
+class ErrorSort(str, Enum):
+    occurrence = 'occurrence'
+    users_count = 'users'
+    sessions_count = 'sessions'
+
+
 class SearchErrorsSchema(SessionsSearchPayloadSchema):
+    sort: ErrorSort = Field(default=ErrorSort.occurrence)
     density: Optional[int] = Field(7)
     status: Optional[ErrorStatus] = Field(default=ErrorStatus.all)
     query: Optional[str] = Field(default=None)
diff --git a/ee/api/chalicelib/core/errors.py b/ee/api/chalicelib/core/errors.py
index 407e94052..8531d89a3 100644
--- a/ee/api/chalicelib/core/errors.py
+++ b/ee/api/chalicelib/core/errors.py
@@ -438,9 +438,9 @@ def __get_step_size(startTimestamp, endTimestamp, density):
 
 def __get_sort_key(key):
     return {
-        "datetime": "max_datetime",
-        "lastOccurrence": "max_datetime",
-        "firstOccurrence": "min_datetime"
+        schemas.ErrorSort.occurrence: "max_datetime",
+        schemas.ErrorSort.users_count: "users",
+        schemas.ErrorSort.sessions_count: "sessions"
     }.get(key, 'max_datetime')