diff --git a/src/core/immerClass.ts b/src/core/immerClass.ts
index 2922f612..240a493b 100644
--- a/src/core/immerClass.ts
+++ b/src/core/immerClass.ts
@@ -208,6 +208,7 @@ export class Immer implements ProducersFns {
 		let i: number
 		for (i = patches.length - 1; i >= 0; i--) {
 			const patch = patches[i]
+			if (!patch) continue
 			if (patch.path.length === 0 && patch.op === "replace") {
 				base = patch.value
 				break
diff --git a/src/utils/common.ts b/src/utils/common.ts
index 513c153e..d047a1d5 100644
--- a/src/utils/common.ts
+++ b/src/utils/common.ts
@@ -216,6 +216,7 @@ export function shallowCopy(base: any, strict: StrictMode) {
 		for (let i = 0; i < keys.length; i++) {
 			const key: any = keys[i]
 			const desc = descriptors[key]
+			if (!desc) continue
 			if (desc[WRITABLE] === false) {
 				desc[WRITABLE] = true
 				desc[CONFIGURABLE] = true