diff --git a/.github/workflows/quality.yml b/.github/workflows/quality.yml
index 2409f04..b719d04 100644
--- a/.github/workflows/quality.yml
+++ b/.github/workflows/quality.yml
@@ -31,6 +31,7 @@ jobs:
           paths: ${{ github.workspace }}/**/build/reports/kover/report.xml
           token: ${{ secrets.GITHUB_TOKEN }}
           update-comment: true
+          title: Coverage Report
           min-coverage-changed-files: 0
           min-coverage-overall: 0
 
diff --git a/src/main/kotlin/ch/srgssr/pillarbox/monitoring/event/model/EventRequest.kt b/src/main/kotlin/ch/srgssr/pillarbox/monitoring/event/model/EventRequest.kt
index 06ee1fe..1898df7 100644
--- a/src/main/kotlin/ch/srgssr/pillarbox/monitoring/event/model/EventRequest.kt
+++ b/src/main/kotlin/ch/srgssr/pillarbox/monitoring/event/model/EventRequest.kt
@@ -23,6 +23,7 @@ import org.springframework.data.elasticsearch.annotations.FieldType
  * @property sessionId The ID of the session associated with the event.
  * @property eventName The name of the event.
  * @property timestamp The timestamp of the event in epoch milliseconds.
+ * @property ip The ip address of the client that generated the event.
  * @property data Additional data associated with the event.
  * @property session Session data associated with the event, potentially updated later.
  */
@@ -31,18 +32,24 @@ data class EventRequest(
   @Id
   @JsonIgnore
   var id: String? = null,
-  @JsonProperty("session_id")
+  @JsonProperty("session_id", required = true)
   @Field("session_id")
   var sessionId: String,
-  @JsonProperty("event_name")
+  @JsonProperty("event_name", required = true)
   @Field("event_name")
   var eventName: String,
   @Field(type = FieldType.Date, format = [DateFormat.epoch_millis], name = "@timestamp")
+  @JsonProperty(required = true)
   var timestamp: Long,
+  @JsonProperty("user_ip")
+  @Field("user_ip")
+  var ip: String?,
+  @JsonProperty(required = true)
   var version: Long,
   @JsonDeserialize(using = DataDeserializer::class)
-  var data: Any? = null,
-  var session: Any? = null,
+  @JsonProperty(required = true)
+  var data: Any,
+  var session: Any?,
 )
 
 /**
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index acad0d2..fc84f5c 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -1,6 +1,9 @@
 spring:
   threads.virtual.enabled: true
   application.name: pillarbox-monitoring-transfer
+  jackson.deserialization:
+      fail-on-null-for-primitives: true
+
 
 pillarbox.monitoring:
   dispatch.uri: "http://localhost:8080/events"
diff --git a/src/test/kotlin/ch/srgssr/pillarbox/monitoring/event/model/EventRequestTest.kt b/src/test/kotlin/ch/srgssr/pillarbox/monitoring/event/model/EventRequestTest.kt
index bb5bddb..c111d84 100644
--- a/src/test/kotlin/ch/srgssr/pillarbox/monitoring/event/model/EventRequestTest.kt
+++ b/src/test/kotlin/ch/srgssr/pillarbox/monitoring/event/model/EventRequestTest.kt
@@ -1,7 +1,9 @@
 package ch.srgssr.pillarbox.monitoring.event.model
 
+import com.fasterxml.jackson.databind.JsonMappingException
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.module.kotlin.readValue
+import io.kotest.assertions.throwables.shouldThrow
 import io.kotest.core.spec.style.ShouldSpec
 import io.kotest.matchers.shouldBe
 import org.springframework.boot.test.context.SpringBootTest
@@ -10,6 +12,68 @@ import org.springframework.boot.test.context.SpringBootTest
 class EventRequestTest(
   private val objectMapper: ObjectMapper,
 ) : ShouldSpec({
+    should("deserialize successfully if all required fields are present") {
+      // Given: an event as json
+      val jsonInput =
+        """
+        {
+          "session_id": "12345",
+          "event_name": "START",
+          "timestamp": 1630000000000,
+          "user_ip": "127.0.0.1",
+          "version": 1,
+          "data": { }
+          }
+        }
+        """.trimIndent()
+
+      // When: the event is deserialized
+      val eventRequest = objectMapper.readValue<EventRequest>(jsonInput)
+
+      // Then: The data of the event should be correctly parsed.
+      eventRequest.sessionId shouldBe "12345"
+      eventRequest.eventName shouldBe "START"
+      eventRequest.timestamp shouldBe 1630000000000
+      eventRequest.ip shouldBe "127.0.0.1"
+      eventRequest.version shouldBe 1
+    }
+
+    context("fail to deserialize if missing any required field") {
+      val baseJson =
+        mapOf(
+          "session_id" to "\"12345\"",
+          "event_name" to "\"START\"",
+          "timestamp" to "1630000000000",
+          "version" to "1",
+          "data" to "{}",
+        )
+
+      baseJson.keys.forEach { missingField ->
+        should("fail if $missingField is missing") {
+          val jsonInput =
+            baseJson
+              .filterKeys { it != missingField } // Exclude the current field
+              .map { (key, value) -> "\"$key\": $value" }
+              .joinToString(prefix = "{", postfix = "}")
+
+          shouldThrow<JsonMappingException> {
+            objectMapper.readValue<EventRequest>(jsonInput)
+          }
+        }
+        should("fail if $missingField is null") {
+          val jsonInput =
+            baseJson
+              .map { (key, value) ->
+                "\"$key\": ${if (key == missingField) "null" else value}"
+              }.joinToString(prefix = "{", postfix = "}")
+
+          shouldThrow<JsonMappingException> {
+            objectMapper.readValue<EventRequest>(jsonInput)
+          }
+        }
+      }
+    }
+
     should("deserialize an event and resolve user agent") {
       // Given: an input with a user agent
       val jsonInput =
@@ -18,6 +82,7 @@ class EventRequestTest(
           "session_id": "12345",
           "event_name": "START",
           "timestamp": 1630000000000,
+          "user_ip": "127.0.0.1",
           "version": 1,
           "data": {
             "browser": {
@@ -55,6 +120,7 @@ class EventRequestTest(
           "session_id": "12345",
           "event_name": "START",
           "timestamp": 1630000000000,
+          "user_ip": "127.0.0.1",
           "version": 1,
           "data": {
             "browser": {
@@ -92,6 +158,7 @@ class EventRequestTest(
           "session_id": "12345",
           "event_name": "START",
           "timestamp": 1630000000000,
+          "user_ip": "127.0.0.1",
           "version": 1,
           "data": {
             "browser": {