diff --git a/src/NodeGraphicsObject.cpp b/src/NodeGraphicsObject.cpp
index efa473a2..52dba2df 100644
--- a/src/NodeGraphicsObject.cpp
+++ b/src/NodeGraphicsObject.cpp
@@ -223,6 +223,16 @@ mousePressEvent(QGraphicsSceneMouseEvent * event)
     {
       NodeState const & nodeState = _node.nodeState();
 
+      // Ports with no data type cannot make a connection.
+      {
+        const NodeDataModel* model = _node.nodeDataModel();
+        const NodeDataType dataType = model->dataType(portToCheck, portIndex);
+        if (dataType.id.isEmpty())
+        {
+          continue;
+        }
+      }
+      
       std::unordered_map<QUuid, Connection*> connections =
         nodeState.connections(portToCheck, portIndex);
 
diff --git a/src/NodePainter.cpp b/src/NodePainter.cpp
index c3bdf7ae..4bd88f8e 100644
--- a/src/NodePainter.cpp
+++ b/src/NodePainter.cpp
@@ -128,6 +128,12 @@ drawConnectionPoints(QPainter* painter,
 
       auto const & dataType = model->dataType(portType, i);
 
+      // Empty data types are not drawn.
+      if (dataType.id.isEmpty())
+      {
+        continue;
+      }
+
       bool canConnect = (state.getEntries(portType)[i].empty() ||
                          (portType == PortType::Out &&
                           model->portOutConnectionPolicy(i) == NodeDataModel::ConnectionPolicy::Many) );