Missing return statement does not produce an error

Question

This is just a curiosity thing, but I have the following code. I'm adding elements to a linked list recursively. This code works perfectly fine.

But when I remove the return statement from the insert function, it does not throw an error. The program compiles and when I run it I get a "Segmentation Fault".

I find this strange. Shouldn't a missing return statement produce an error?

Just wondering why it wouldn't:

Node* insert(Node* node, int values[]) {
    for (int i=0; i < 9; i++) {
        insertRecursively(node, values[i]);
    }
    return node;
}

int main() {
    int a[] = {1,2,3,4,5,6,7,8,9};  
    node = insert(node, a);
    print(node);
    return 0;
}