diff --git a/backend/open_webui/routers/tasks.py b/backend/open_webui/routers/tasks.py
index 8b17c6c4b..0328cefe0 100644
--- a/backend/open_webui/routers/tasks.py
+++ b/backend/open_webui/routers/tasks.py
@@ -208,7 +208,7 @@ async def generate_title(
         "stream": False,
         **(
             {"max_tokens": 1000}
-            if models[task_model_id]["owned_by"] == "ollama"
+            if models[task_model_id].get("owned_by") == "ollama"
             else {
                 "max_completion_tokens": 1000,
             }
@@ -571,7 +571,7 @@ async def generate_emoji(
         "stream": False,
         **(
             {"max_tokens": 4}
-            if models[task_model_id]["owned_by"] == "ollama"
+            if models[task_model_id].get("owned_by") == "ollama"
             else {
                 "max_completion_tokens": 4,
             }
diff --git a/backend/open_webui/utils/chat.py b/backend/open_webui/utils/chat.py
index 73e4264bf..209fb02dc 100644
--- a/backend/open_webui/utils/chat.py
+++ b/backend/open_webui/utils/chat.py
@@ -200,7 +200,7 @@ async def generate_chat_completion(
             except Exception as e:
                 raise e
 
-        if model["owned_by"] == "arena":
+        if model.get("owned_by") == "arena":
             model_ids = model.get("info", {}).get("meta", {}).get("model_ids")
             filter_mode = model.get("info", {}).get("meta", {}).get("filter_mode")
             if model_ids and filter_mode == "exclude":
@@ -253,7 +253,7 @@ async def generate_chat_completion(
             return await generate_function_chat_completion(
                 request, form_data, user=user, models=models
             )
-        if model["owned_by"] == "ollama":
+        if model.get("owned_by") == "ollama":
             # Using /ollama/api/chat endpoint
             form_data = convert_payload_openai_to_ollama(form_data)
             response = await generate_ollama_chat_completion(
diff --git a/backend/open_webui/utils/middleware.py b/backend/open_webui/utils/middleware.py
index ba55c095e..27e751e0b 100644
--- a/backend/open_webui/utils/middleware.py
+++ b/backend/open_webui/utils/middleware.py
@@ -800,7 +800,7 @@ async def process_chat_payload(request, form_data, metadata, user, model):
 
         # Workaround for Ollama 2.0+ system prompt issue
         # TODO: replace with add_or_update_system_message
-        if model["owned_by"] == "ollama":
+        if model.get("owned_by") == "ollama":
             form_data["messages"] = prepend_to_first_user_message_content(
                 rag_template(
                     request.app.state.config.RAG_TEMPLATE, context_string, prompt
diff --git a/backend/open_webui/utils/models.py b/backend/open_webui/utils/models.py
index 975f8cb09..a2c0eadca 100644
--- a/backend/open_webui/utils/models.py
+++ b/backend/open_webui/utils/models.py
@@ -142,7 +142,7 @@ async def get_all_models(request):
                     custom_model.base_model_id == model["id"]
                     or custom_model.base_model_id == model["id"].split(":")[0]
                 ):
-                    owned_by = model["owned_by"]
+                    owned_by = model.get("owned_by", "unknown owner")
                     if "pipe" in model:
                         pipe = model["pipe"]
                     break
diff --git a/backend/open_webui/utils/task.py b/backend/open_webui/utils/task.py
index 3d8c05d45..5663ce2ac 100644
--- a/backend/open_webui/utils/task.py
+++ b/backend/open_webui/utils/task.py
@@ -22,7 +22,7 @@ def get_task_model_id(
     # Set the task model
     task_model_id = default_model_id
     # Check if the user has a custom task model and use that model
-    if models[task_model_id]["owned_by"] == "ollama":
+    if models[task_model_id].get("owned_by") == "ollama":
         if task_model and task_model in models:
             task_model_id = task_model
     else: