diff --git a/.generator/src/generator/templates/model/ObjectSerializer.j2 b/.generator/src/generator/templates/model/ObjectSerializer.j2
index b9115620b6e..f775b272638 100644
--- a/.generator/src/generator/templates/model/ObjectSerializer.j2
+++ b/.generator/src/generator/templates/model/ObjectSerializer.j2
@@ -57,6 +57,9 @@ export class ObjectSerializer {
     } else if (primitives.includes(type.toLowerCase()) && typeof data == type.toLowerCase()) {
       return data;
     } else if (type.startsWith(ARRAY_PREFIX)) {
+      if (!Array.isArray(data)) {
+          throw new TypeError(`mismatch types '${data}' and '${type}'`);
+      }
       // Array<Type> => Type
       const subType: string = type.substring(ARRAY_PREFIX.length, type.length - 1);
       const transformedData: any[] = [];
@@ -160,6 +163,10 @@ export class ObjectSerializer {
     } else if (primitives.includes(type.toLowerCase()) && typeof data == type.toLowerCase()) {
       return data;
     } else if (type.startsWith(ARRAY_PREFIX)) {
+      // Assert the passed data is Array type
+      if (!Array.isArray(data)) {
+          throw new TypeError(`mismatch types '${data}' and '${type}'`);
+      }
       // Array<Type> => Type
       const subType: string = type.substring(ARRAY_PREFIX.length, type.length - 1);
       const transformedData: any[] = [];
diff --git a/packages/datadog-api-client-v1/models/ObjectSerializer.ts b/packages/datadog-api-client-v1/models/ObjectSerializer.ts
index b6b252749f7..20aa3cf76da 100644
--- a/packages/datadog-api-client-v1/models/ObjectSerializer.ts
+++ b/packages/datadog-api-client-v1/models/ObjectSerializer.ts
@@ -1859,6 +1859,9 @@ export class ObjectSerializer {
     ) {
       return data;
     } else if (type.startsWith(ARRAY_PREFIX)) {
+      if (!Array.isArray(data)) {
+        throw new TypeError(`mismatch types '${data}' and '${type}'`);
+      }
       // Array<Type> => Type
       const subType: string = type.substring(
         ARRAY_PREFIX.length,
@@ -1998,6 +2001,10 @@ export class ObjectSerializer {
     ) {
       return data;
     } else if (type.startsWith(ARRAY_PREFIX)) {
+      // Assert the passed data is Array type
+      if (!Array.isArray(data)) {
+        throw new TypeError(`mismatch types '${data}' and '${type}'`);
+      }
       // Array<Type> => Type
       const subType: string = type.substring(
         ARRAY_PREFIX.length,
diff --git a/packages/datadog-api-client-v2/models/ObjectSerializer.ts b/packages/datadog-api-client-v2/models/ObjectSerializer.ts
index b9c93b02792..3e275d3e644 100644
--- a/packages/datadog-api-client-v2/models/ObjectSerializer.ts
+++ b/packages/datadog-api-client-v2/models/ObjectSerializer.ts
@@ -1018,6 +1018,9 @@ export class ObjectSerializer {
     ) {
       return data;
     } else if (type.startsWith(ARRAY_PREFIX)) {
+      if (!Array.isArray(data)) {
+        throw new TypeError(`mismatch types '${data}' and '${type}'`);
+      }
       // Array<Type> => Type
       const subType: string = type.substring(
         ARRAY_PREFIX.length,
@@ -1157,6 +1160,10 @@ export class ObjectSerializer {
     ) {
       return data;
     } else if (type.startsWith(ARRAY_PREFIX)) {
+      // Assert the passed data is Array type
+      if (!Array.isArray(data)) {
+        throw new TypeError(`mismatch types '${data}' and '${type}'`);
+      }
       // Array<Type> => Type
       const subType: string = type.substring(
         ARRAY_PREFIX.length,