diff --git a/types/d3-selection/d3-selection-tests.ts b/types/d3-selection/d3-selection-tests.ts
index 54ddb5ea11..b99c81e39a 100644
--- a/types/d3-selection/d3-selection-tests.ts
+++ b/types/d3-selection/d3-selection-tests.ts
@@ -796,7 +796,7 @@ newDiv2 = body.append(function(d, i, g) {
     const index: number = i;
     const group: HTMLBodyElement[] | d3Selection.ArrayLike<HTMLBodyElement> = g;
     console.log('Body element foo property: ', d.foo); // data of type BodyDatum
-    return this.ownerDocument.createElement('div'); // this-type HTMLBodyElement
+    return this.ownerDocument!.createElement('div'); // this-type HTMLBodyElement
 });
 
 // newDiv2 = body.append<HTMLDivElement>(function(d) {
@@ -828,7 +828,7 @@ const typeValueFunction = function(
   i: number,
   g: HTMLBodyElement[] | d3Selection.ArrayLike<HTMLBodyElement>
 ) {
-    return this.ownerDocument.createElement('p'); // this-type HTMLParagraphElement
+    return this.ownerDocument!.createElement('p'); // this-type HTMLParagraphElement
 };
 
 const beforeValueFunction = function(
diff --git a/types/d3-selection/index.d.ts b/types/d3-selection/index.d.ts
index d1e127dfdf..d9988636fd 100644
--- a/types/d3-selection/index.d.ts
+++ b/types/d3-selection/index.d.ts
@@ -22,7 +22,7 @@ export type BaseType = Element | EnterElement | Document | Window | null;
  */
 export interface ArrayLike<T> {
     length: number;
-    item(index: number): T;
+    item(index: number): T | null;
     [index: number]: T;
 }