diff --git a/package-lock.json b/package-lock.json
index 88a7f79c7..849e6bbd8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@sinclair/typebox",
-  "version": "0.31.16",
+  "version": "0.31.17",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@sinclair/typebox",
-      "version": "0.31.16",
+      "version": "0.31.17",
       "license": "MIT",
       "devDependencies": {
         "@sinclair/hammer": "^0.17.1",
diff --git a/package.json b/package.json
index fe958029c..198997ca2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@sinclair/typebox",
-  "version": "0.31.16",
+  "version": "0.31.17",
   "description": "JSONSchema Type Builder with Static Type Resolution for TypeScript",
   "keywords": [
     "typescript",
diff --git a/src/compiler/compiler.ts b/src/compiler/compiler.ts
index 0c9d2b958..9e840ca92 100644
--- a/src/compiler/compiler.ts
+++ b/src/compiler/compiler.ts
@@ -204,7 +204,7 @@ export namespace TypeCompiler {
       const checkExpression = CreateExpression(containsSchema, references, 'value')
       const checkMinContains = IsNumber(schema.minContains) ? [`(count >= ${schema.minContains})`] : []
       const checkMaxContains = IsNumber(schema.maxContains) ? [`(count <= ${schema.maxContains})`] : []
-      const checkCount = `const count = ${value}.reduce((${accumulator}, ${parameter}) => ${checkExpression} ? acc + 1 : acc, 0)`
+      const checkCount = `const count = value.reduce((${accumulator}, ${parameter}) => ${checkExpression} ? acc + 1 : acc, 0)`
       const check = [`(count > 0)`, ...checkMinContains, ...checkMaxContains].join(' && ')
       yield `((${parameter}) => { ${checkCount}; return ${check}})(${value})`
     }
diff --git a/test/runtime/compiler-ajv/array.ts b/test/runtime/compiler-ajv/array.ts
index dd9feaea4..589bc03ac 100644
--- a/test/runtime/compiler-ajv/array.ts
+++ b/test/runtime/compiler-ajv/array.ts
@@ -145,4 +145,42 @@ describe('compiler-ajv/Array', () => {
     Fail(T, [1, 1, 1, 1, 1])
     Fail(T, [1, 1, 1, 1, 1, 1])
   })
+  // ----------------------------------------------------------------
+  // Issue: https://github.com/sinclairzx81/typebox/discussions/607
+  // ----------------------------------------------------------------
+  it('Should correctly handle undefined array properties', () => {
+    const Answer = Type.Object({
+      text: Type.String(),
+      isCorrect: Type.Boolean(),
+    })
+    const Question = Type.Object({
+      text: Type.String(),
+      options: Type.Array(Answer, {
+        minContains: 1,
+        maxContains: 1,
+        contains: Type.Object({
+          text: Type.String(),
+          isCorrect: Type.Literal(true),
+        }),
+      }),
+    })
+    Fail(Question, { text: 'A' })
+    Fail(Question, { text: 'A', options: [] })
+    Ok(Question, { text: 'A', options: [{ text: 'A', isCorrect: true }] })
+    Ok(Question, {
+      text: 'A',
+      options: [
+        { text: 'A', isCorrect: true },
+        { text: 'B', isCorrect: false },
+      ],
+    })
+    Fail(Question, { text: 'A', options: [{ text: 'A', isCorrect: false }] })
+    Fail(Question, {
+      text: 'A',
+      options: [
+        { text: 'A', isCorrect: true },
+        { text: 'B', isCorrect: true },
+      ],
+    })
+  })
 })
diff --git a/test/runtime/compiler/array.ts b/test/runtime/compiler/array.ts
index ae8fa4a6a..70af4c500 100644
--- a/test/runtime/compiler/array.ts
+++ b/test/runtime/compiler/array.ts
@@ -145,4 +145,42 @@ describe('compiler/Array', () => {
     Fail(T, [1, 1, 1, 1, 1])
     Fail(T, [1, 1, 1, 1, 1, 1])
   })
+  // ----------------------------------------------------------------
+  // Issue: https://github.com/sinclairzx81/typebox/discussions/607
+  // ----------------------------------------------------------------
+  it('Should correctly handle undefined array properties', () => {
+    const Answer = Type.Object({
+      text: Type.String(),
+      isCorrect: Type.Boolean(),
+    })
+    const Question = Type.Object({
+      text: Type.String(),
+      options: Type.Array(Answer, {
+        minContains: 1,
+        maxContains: 1,
+        contains: Type.Object({
+          text: Type.String(),
+          isCorrect: Type.Literal(true),
+        }),
+      }),
+    })
+    Fail(Question, { text: 'A' })
+    Fail(Question, { text: 'A', options: [] })
+    Ok(Question, { text: 'A', options: [{ text: 'A', isCorrect: true }] })
+    Ok(Question, {
+      text: 'A',
+      options: [
+        { text: 'A', isCorrect: true },
+        { text: 'B', isCorrect: false },
+      ],
+    })
+    Fail(Question, { text: 'A', options: [{ text: 'A', isCorrect: false }] })
+    Fail(Question, {
+      text: 'A',
+      options: [
+        { text: 'A', isCorrect: true },
+        { text: 'B', isCorrect: true },
+      ],
+    })
+  })
 })
diff --git a/test/runtime/value/check/array.ts b/test/runtime/value/check/array.ts
index 421a3e19a..9ad1be58c 100644
--- a/test/runtime/value/check/array.ts
+++ b/test/runtime/value/check/array.ts
@@ -110,4 +110,46 @@ describe('value/check/Array', () => {
     Assert.IsFalse(Value.Check(T, [1, 1, 1, 1, 1]))
     Assert.IsFalse(Value.Check(T, [1, 1, 1, 1, 1, 1]))
   })
+  // ----------------------------------------------------------------
+  // Issue: https://github.com/sinclairzx81/typebox/discussions/607
+  // ----------------------------------------------------------------
+  it('Should correctly handle undefined array properties', () => {
+    const Answer = Type.Object({
+      text: Type.String(),
+      isCorrect: Type.Boolean(),
+    })
+    const Question = Type.Object({
+      text: Type.String(),
+      options: Type.Array(Answer, {
+        minContains: 1,
+        maxContains: 1,
+        contains: Type.Object({
+          text: Type.String(),
+          isCorrect: Type.Literal(true),
+        }),
+      }),
+    })
+    Assert.IsFalse(Value.Check(Question, { text: 'A' }))
+    Assert.IsFalse(Value.Check(Question, { text: 'A', options: [] }))
+    Assert.IsTrue(Value.Check(Question, { text: 'A', options: [{ text: 'A', isCorrect: true }] }))
+    Assert.IsTrue(
+      Value.Check(Question, {
+        text: 'A',
+        options: [
+          { text: 'A', isCorrect: true },
+          { text: 'B', isCorrect: false },
+        ],
+      }),
+    )
+    Assert.IsFalse(Value.Check(Question, { text: 'A', options: [{ text: 'A', isCorrect: false }] }))
+    Assert.IsFalse(
+      Value.Check(Question, {
+        text: 'A',
+        options: [
+          { text: 'A', isCorrect: true },
+          { text: 'B', isCorrect: true },
+        ],
+      }),
+    )
+  })
 })