diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 9554a42c..6b1d789a 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -56,6 +56,9 @@ jobs:
       - name: install-cpprest
         run: sudo apt install libcpprest-dev
 
+      - name: install-cpprest
+        run: sudo apt install libcpprest-dev
+
       - name: install-boost
         uses: MarkusJx/install-boost@v2.4.4
         id: install-boost
diff --git a/client/templates/main.html b/client/templates/main.html
index 86db4342..646c9adc 100644
--- a/client/templates/main.html
+++ b/client/templates/main.html
@@ -329,6 +329,7 @@ <h3></h3>
           deleteLayer(layer_to_delete).then(response => {
             if (response.ok) {
               super.removeNodeId(id)
+              updateConnectionsInLayers(id.split("-")[1])
             } else {
               errorNotification("Failed to delete layer.\n Server is not responding now.")
             }
@@ -569,7 +570,7 @@ <h3></h3>
           if (response.ok) {
             editor.updateNodeDataFromId(connection.input_id, {
               DBID: data2.DBID,
-              Connections: [].concat(`${data1.DBID};${connection.output_id}`, data2.Connections), // "db_id;drawflow_id"
+              Connections: data2.Connections.concat(`${data1.DBID};${connection.output_id}`), // "db_id;drawflow_id"
               Parameters: data2.Parameters,
             })
           } else {
@@ -1369,6 +1370,7 @@ <h3></h3>
 
         // Input selection
         writeIdOnConnections(input_selection_layer_id)
+
         let sortable_list = getSortableInputList(node)
         let child = sortable_list.lastElementChild
 
@@ -1397,8 +1399,9 @@ <h3></h3>
             new_input_order = []
             for (let i in sortable_list.childNodes) {
               try {
-                if (sortable_list.childNodes[i].textContent.includes("input")) {
-                  new_input_order.push(Number(sortable_list.childNodes[i].textContent.split(" ")[3]))
+                if (sortable_list.childNodes[i].textContent.length > 0) {
+                  console.log(sortable_list.childNodes[i].textContent)
+                  new_input_order.push(Number(sortable_list.childNodes[i].textContent))
                 }
               } catch (e) {
                 continue
@@ -1608,6 +1611,25 @@ <h3></h3>
           }
         }
       }
+
+      function updateConnectionsInLayers(deleted_id) {
+        let nodes = document.getElementsByClassName("drawflow-node")
+        for (let i of nodes) {
+          const data1 = editor.getNodeFromId(i.id.split("-")[1]).data
+          let updatedConnections = []
+          for (let connection of data1.Connections) {
+            if (connection.split(";")[1] == deleted_id) {
+              continue
+            }
+            updatedConnections.unshift(connection)
+          }
+          editor.updateNodeDataFromId(i.id.split("-")[1], {
+            DBID: data1.DBID,
+            Connections: updatedConnections,
+            Parameters: data1.Parameters,
+          })
+        }
+      }
     </script>
 
     <!--Терминал-->
diff --git a/py_server/mlcraft/server.py b/py_server/mlcraft/server.py
index 2271bc1c..ed9dc61a 100644
--- a/py_server/mlcraft/server.py
+++ b/py_server/mlcraft/server.py
@@ -51,7 +51,7 @@ def add_model(user_id: int):
     return {"model_id": inserted_id}, HTTPStatus.CREATED
 
 
-@app.route("/<int:user_id>/<int:model_id>", methods=["GET", "PUT", "PATCH", "DELETE"])
+@app.route("/<int:user_id>/<int:model_id>", methods=["GET", "PUT", "DELETE"])
 def model(user_id: int, model_id: int):
     sql_worker.verify_access(user_id, model_id)
     match request.method:
@@ -160,6 +160,8 @@ def train_model(
 ):  # Unfortunately, flask don't have convertor for bool
     # checks belonging of the model to user
     sql_worker.verify_access(user_id, model_id)
+    if not request.data:
+        raise Error("No csv data provided")
     if sql_worker.is_model_trained(model_id) and safe:
         raise Error("Already trained", HTTPStatus.PRECONDITION_FAILED)
 
diff --git a/server/api/DataLoader.cpp b/server/api/DataLoader.cpp
index 6c2149f3..765fc7f0 100644
--- a/server/api/DataLoader.cpp
+++ b/server/api/DataLoader.cpp
@@ -38,6 +38,7 @@ std::pair<Blob, std::vector<float>> DataLoader::operator[](std::size_t index) co
 }
 
 std::size_t DataLoader::size() const {
+
     return loader->size();
 }