diff --git a/internal/manager/custom_provider.go b/internal/manager/custom_provider.go
index 455b9bb..32f9fc9 100644
--- a/internal/manager/custom_provider.go
+++ b/internal/manager/custom_provider.go
@@ -17,7 +17,7 @@ type CustomProvidersStorage interface {
 	GetCustomProviders() ([]*custom.Provider, error)
 	GetCustomProviderByName(name string) (*custom.Provider, error)
 	GetCustomProvider(id string) (*custom.Provider, error)
-	UpdateCustomProvider(id string, provider *custom.Provider) (*custom.Provider, error)
+	UpdateCustomProvider(id string, provider *custom.UpdateProvider) (*custom.Provider, error)
 }
 
 type CustomProvidersMemStorage interface {
@@ -73,7 +73,7 @@ func gatherEmptyFieldsFromRouteConfig(index int, rc *custom.RouteConfig) []strin
 
 }
 
-func validateCustomProviderUpdate(existing *custom.Provider, updated *custom.Provider) error {
+func validateCustomProviderUpdate(existing *custom.Provider, updated *custom.UpdateProvider) error {
 	invalidFields := []string{}
 	pathToRouteMap := map[string]*custom.RouteConfig{}
 
@@ -226,7 +226,7 @@ func (m *CustomProvidersManager) GetCustomProviders() ([]*custom.Provider, error
 	return m.Storage.GetCustomProviders()
 }
 
-func (m *CustomProvidersManager) UpdateCustomProvider(id string, provider *custom.Provider) (*custom.Provider, error) {
+func (m *CustomProvidersManager) UpdateCustomProvider(id string, provider *custom.UpdateProvider) (*custom.Provider, error) {
 	provider.UpdatedAt = time.Now().Unix()
 
 	existing, err := m.Storage.GetCustomProvider(id)
diff --git a/internal/provider/custom/provider.go b/internal/provider/custom/provider.go
index b453ec5..8f36b3e 100644
--- a/internal/provider/custom/provider.go
+++ b/internal/provider/custom/provider.go
@@ -20,3 +20,9 @@ type RouteConfig struct {
 	StreamResponseCompletionLocation string `json:"stream_response_completion_location"`
 	StreamMaxEmptyMessages           int    `json:"stream_max_empty_messages"`
 }
+
+type UpdateProvider struct {
+	UpdatedAt           int64          `json:"updated_at"`
+	RouteConfigs        []*RouteConfig `json:"route_configs"`
+	AuthenticationParam *string        `json:"authentication_param"`
+}
diff --git a/internal/server/web/admin.go b/internal/server/web/admin.go
index 79d70d2..d299ee5 100644
--- a/internal/server/web/admin.go
+++ b/internal/server/web/admin.go
@@ -924,7 +924,7 @@ type CustomProvidersManager interface {
 	GetCustomProviders() ([]*custom.Provider, error)
 	GetRouteConfigFromMem(name, path string) *custom.RouteConfig
 	GetCustomProviderFromMem(name string) *custom.Provider
-	UpdateCustomProvider(id string, setting *custom.Provider) (*custom.Provider, error)
+	UpdateCustomProvider(id string, setting *custom.UpdateProvider) (*custom.Provider, error)
 }
 
 func getCreateCustomProviderHandler(m CustomProvidersManager, log *zap.Logger, prod bool) gin.HandlerFunc {
@@ -1100,7 +1100,7 @@ func getUpdateCustomProvidersHandler(m CustomProvidersManager, log *zap.Logger,
 			return
 		}
 
-		setting := &custom.Provider{}
+		setting := &custom.UpdateProvider{}
 		err = json.Unmarshal(data, setting)
 		if err != nil {
 			logError(log, "error when unmarshalling update a custom provider request body", prod, cid, err)
diff --git a/internal/storage/postgresql/custom_provider.go b/internal/storage/postgresql/custom_provider.go
index de8e524..ff16a41 100644
--- a/internal/storage/postgresql/custom_provider.go
+++ b/internal/storage/postgresql/custom_provider.go
@@ -133,6 +133,10 @@ func (s *Store) GetCustomProvider(id string) (*custom.Provider, error) {
 		return nil, err
 	}
 
+	if err := json.Unmarshal(data, &retrieved.RouteConfigs); err != nil {
+		return nil, err
+	}
+
 	return retrieved, nil
 }
 
@@ -171,7 +175,7 @@ func (s *Store) GetCustomProviders() ([]*custom.Provider, error) {
 	return providers, nil
 }
 
-func (s *Store) UpdateCustomProvider(id string, provider *custom.Provider) (*custom.Provider, error) {
+func (s *Store) UpdateCustomProvider(id string, provider *custom.UpdateProvider) (*custom.Provider, error) {
 	ctxTimeout, cancel := context.WithTimeout(context.Background(), s.rt)
 	defer cancel()
 
@@ -186,7 +190,7 @@ func (s *Store) UpdateCustomProvider(id string, provider *custom.Provider) (*cus
 		id,
 	}
 
-	if len(provider.AuthenticationParam) != 0 {
+	if provider.AuthenticationParam != nil {
 		values = append(values, provider.AuthenticationParam)
 		fields = append(fields, fmt.Sprintf("authentication_param = $%d", counter))
 		counter++
@@ -339,6 +343,18 @@ func mergeRouterConfigs(existingConfigs []*custom.RouteConfig, targetConfigs []*
 			merged.StreamResponseCompletionLocation = existing.StreamResponseCompletionLocation
 		}
 
+		if target.StreamMaxEmptyMessages != 0 {
+			merged.StreamMaxEmptyMessages = target.StreamMaxEmptyMessages
+		}
+
+		if target.StreamMaxEmptyMessages == 0 {
+			merged.StreamMaxEmptyMessages = existing.StreamMaxEmptyMessages
+		}
+
+		if len(target.StreamResponseCompletionLocation) == 0 {
+			merged.StreamResponseCompletionLocation = existing.StreamResponseCompletionLocation
+		}
+
 		if len(target.TargetUrl) != 0 {
 			merged.TargetUrl = target.TargetUrl
 		}
@@ -347,7 +363,7 @@ func mergeRouterConfigs(existingConfigs []*custom.RouteConfig, targetConfigs []*
 			merged.TargetUrl = existing.TargetUrl
 		}
 
-		pathToRouteMap[target.Path] = merged
+		pathToRouteMap[merged.Path] = merged
 	}
 
 	for _, v := range pathToRouteMap {