[DOT] failed at node 0[1] dot: maze.c:315: chkSgraph: Assertion `np->cells[1]' failed.

Hello

I have a very simple dot file:

digraph map {
    splines=ortho;
    layout="dot";
    rankdir="LR";

    # Clusters
    subgraph "cluster_1" {
        node [style=filled];
        style=filled;

        label="Cluster 1";
        color="pink";

        #Nodes
        "node1" [fillcolor=red,shape=house]
    }
    subgraph "cluster_2" {
        node [style=filled];
        style=filled;

        label="Cluster 2";
        color="lightblue";

        #Nodes:
        "node2" [fillcolor=red,shape=box3d]
    }


    # Edges
    "node2" -> "node1" [color=red,arrowhead=dot]
}

I use unix dot command: Version = 2.40.1 (20161225.0304)

And I get this error:

failed at node 0[1]
dot: maze.c:315: chkSgraph: Assertion `np->cells[1]' failed.
Aborted

Fun part: when I remove all node1 attributes (line 14) it works...