diff --git a/package.json b/package.json
index a7a8e51..2520a1e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@pomle/shapes",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "description": "TypeScript library for coalescing unknown data into well defined object shapes.",
   "author": "Pontus Alexander <pontus.alexander@gmail.com>",
   "license": "MIT",
diff --git a/src/__tests__/guards.test.ts b/src/__tests__/guards.test.ts
new file mode 100644
index 0000000..e2aa479
--- /dev/null
+++ b/src/__tests__/guards.test.ts
@@ -0,0 +1,37 @@
+import { isIterable } from "../guards";
+
+describe("Guards", () => {
+  describe("#record", () => {
+    it("returns true on array", () => {
+      expect(isIterable([])).toBe(true);
+    });
+
+    it("returns true on set", () => {
+      expect(isIterable(new Set())).toBe(true);
+    });
+
+    it("returns false on null", () => {
+      expect(isIterable(null)).toBe(false);
+    });
+
+    it("returns false on undefined", () => {
+      expect(isIterable(undefined)).toBe(false);
+    });
+
+    it("returns false on object", () => {
+      expect(isIterable({})).toBe(false);
+    });
+
+    it("returns false on string", () => {
+      expect(isIterable("")).toBe(false);
+    });
+
+    it("returns false on number", () => {
+      expect(isIterable(124)).toBe(false);
+    });
+
+    it("returns false on boolean", () => {
+      expect(isIterable(true)).toBe(false);
+    });
+  });
+});
diff --git a/src/guards.ts b/src/guards.ts
index dfb8a20..435c885 100644
--- a/src/guards.ts
+++ b/src/guards.ts
@@ -1,3 +1,3 @@
 export function isIterable(value: any): value is Iterable<unknown> {
-  return typeof value === "object" && Symbol.iterator in value;
+  return value != null && typeof value === "object" && Symbol.iterator in value;
 }