diff --git a/api/core/helper/model_provider_cache.py b/api/core/helper/model_provider_cache.py
index 2b9e6613378..2b7d0d951f1 100644
--- a/api/core/helper/model_provider_cache.py
+++ b/api/core/helper/model_provider_cache.py
@@ -27,7 +27,7 @@ class ProviderCredentialsCache:
             try:
                 cached_provider_credentials = cached_provider_credentials.decode("utf-8")
                 cached_provider_credentials = json.loads(cached_provider_credentials)
-            except JSONDecodeError:
+            except (JSONDecodeError, UnicodeDecodeError):
                 return None
 
             return dict(cached_provider_credentials)
diff --git a/api/core/helper/provider_cache.py b/api/core/helper/provider_cache.py
index a3b61887892..8e85d444d2c 100644
--- a/api/core/helper/provider_cache.py
+++ b/api/core/helper/provider_cache.py
@@ -24,7 +24,7 @@ class ProviderCredentialsCache(ABC):
             try:
                 cached_credentials = cached_credentials.decode("utf-8")
                 return dict(json.loads(cached_credentials))
-            except JSONDecodeError:
+            except (JSONDecodeError, UnicodeDecodeError):
                 return None
         return None
 
diff --git a/api/core/helper/tool_parameter_cache.py b/api/core/helper/tool_parameter_cache.py
index 2650eb0c2c2..6dfe9359d1f 100644
--- a/api/core/helper/tool_parameter_cache.py
+++ b/api/core/helper/tool_parameter_cache.py
@@ -30,7 +30,7 @@ class ToolParameterCache:
             try:
                 cached_tool_parameter = cached_tool_parameter.decode("utf-8")
                 cached_tool_parameter = json.loads(cached_tool_parameter)
-            except JSONDecodeError:
+            except (JSONDecodeError, UnicodeDecodeError):
                 return None
 
             return dict(cached_tool_parameter)
diff --git a/api/tests/unit_tests/core/helper/test_model_provider_cache.py b/api/tests/unit_tests/core/helper/test_model_provider_cache.py
new file mode 100644
index 00000000000..e66d58a4e9f
--- /dev/null
+++ b/api/tests/unit_tests/core/helper/test_model_provider_cache.py
@@ -0,0 +1,32 @@
+import json
+
+from pytest_mock import MockerFixture
+
+from core.helper.model_provider_cache import ProviderCredentialsCache, ProviderCredentialsCacheType
+
+
+def test_model_provider_credentials_cache_get_returns_decoded_dict(mocker: MockerFixture) -> None:
+    redis_client_mock = mocker.patch("core.helper.model_provider_cache.redis_client")
+    cache = ProviderCredentialsCache(
+        tenant_id="tenant",
+        identity_id="identity",
+        cache_type=ProviderCredentialsCacheType.PROVIDER,
+    )
+    payload = {"api_key": "secret"}
+
+    redis_client_mock.get.return_value = json.dumps(payload).encode("utf-8")
+
+    assert cache.get() == payload
+
+
+def test_model_provider_credentials_cache_get_returns_none_for_invalid_utf8(mocker: MockerFixture) -> None:
+    redis_client_mock = mocker.patch("core.helper.model_provider_cache.redis_client")
+    cache = ProviderCredentialsCache(
+        tenant_id="tenant",
+        identity_id="identity",
+        cache_type=ProviderCredentialsCacheType.PROVIDER,
+    )
+
+    redis_client_mock.get.return_value = b"\xff"
+
+    assert cache.get() is None
diff --git a/api/tests/unit_tests/core/helper/test_provider_cache.py b/api/tests/unit_tests/core/helper/test_provider_cache.py
new file mode 100644
index 00000000000..cf9f9c456d7
--- /dev/null
+++ b/api/tests/unit_tests/core/helper/test_provider_cache.py
@@ -0,0 +1,24 @@
+import json
+
+from pytest_mock import MockerFixture
+
+from core.helper.provider_cache import ToolProviderCredentialsCache
+
+
+def test_provider_credentials_cache_get_returns_decoded_dict(mocker: MockerFixture) -> None:
+    redis_client_mock = mocker.patch("core.helper.provider_cache.redis_client")
+    cache = ToolProviderCredentialsCache(tenant_id="tenant", provider="provider", credential_id="credential")
+    payload = {"api_key": "secret"}
+
+    redis_client_mock.get.return_value = json.dumps(payload).encode("utf-8")
+
+    assert cache.get() == payload
+
+
+def test_provider_credentials_cache_get_returns_none_for_invalid_utf8(mocker: MockerFixture) -> None:
+    redis_client_mock = mocker.patch("core.helper.provider_cache.redis_client")
+    cache = ToolProviderCredentialsCache(tenant_id="tenant", provider="provider", credential_id="credential")
+
+    redis_client_mock.get.return_value = b"\xff"
+
+    assert cache.get() is None
diff --git a/api/tests/unit_tests/core/helper/test_tool_parameter_cache.py b/api/tests/unit_tests/core/helper/test_tool_parameter_cache.py
index 3c8b44d0101..54a9fe51009 100644
--- a/api/tests/unit_tests/core/helper/test_tool_parameter_cache.py
+++ b/api/tests/unit_tests/core/helper/test_tool_parameter_cache.py
@@ -38,6 +38,21 @@ def test_tool_parameter_cache_get_returns_none_for_invalid_json(mocker: MockerFi
     assert cache.get() is None
 
 
+def test_tool_parameter_cache_get_returns_none_for_invalid_utf8(mocker: MockerFixture) -> None:
+    redis_client_mock = mocker.patch("core.helper.tool_parameter_cache.redis_client")
+    cache = ToolParameterCache(
+        tenant_id="tenant",
+        provider="provider",
+        tool_name="tool",
+        cache_type=ToolParameterCacheType.PARAMETER,
+        identity_id="identity",
+    )
+
+    redis_client_mock.get.return_value = b"\xff"
+
+    assert cache.get() is None
+
+
 def test_tool_parameter_cache_get_returns_none_when_key_is_missing(mocker: MockerFixture) -> None:
     redis_client_mock = mocker.patch("core.helper.tool_parameter_cache.redis_client")
     cache = ToolParameterCache(