diff --git a/sentry-kotlin-multiplatform/src/appleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.apple.kt b/sentry-kotlin-multiplatform/src/appleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.apple.kt
index 73e6d8f3..53803715 100644
--- a/sentry-kotlin-multiplatform/src/appleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.apple.kt
+++ b/sentry-kotlin-multiplatform/src/appleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.apple.kt
@@ -7,14 +7,14 @@ import io.sentry.kotlin.multiplatform.SentryEvent
 internal fun CocoaSentryEvent.applyKmpEvent(kmpEvent: SentryEvent): CocoaSentryEvent {
     kmpEvent.level?.let { level = it.toCocoaSentryLevel() }
     kmpEvent.platform?.let { platform = it }
-    message = kmpEvent.message?.toCocoaMessage()
-    logger = kmpEvent.logger
+    kmpEvent.release?.let { releaseName = it }
+    kmpEvent.message?.let { message = it.toCocoaMessage() }
+    kmpEvent.logger?.let { logger = it }
+    kmpEvent.environment?.let { environment = it }
+    kmpEvent.user?.let { user = it.toCocoaUser() }
+    kmpEvent.serverName?.let { serverName = it }
+    kmpEvent.dist?.let { dist = it }
     fingerprint = kmpEvent.fingerprint
-    releaseName = kmpEvent.release
-    environment = kmpEvent.environment
-    user = kmpEvent.user?.toCocoaUser()
-    serverName = kmpEvent.serverName
-    dist = kmpEvent.dist
     breadcrumbs = kmpEvent.breadcrumbs.map { it.toCocoaBreadcrumb() }.toMutableList()
     tags = kmpEvent.tags.toMutableMap()
     eventId = SentryId(kmpEvent.eventId.toString())
diff --git a/sentry-kotlin-multiplatform/src/appleTest/kotlin/io/sentry/kotlin/multiplatform/ApplyKmpEventTest.kt b/sentry-kotlin-multiplatform/src/appleTest/kotlin/io/sentry/kotlin/multiplatform/ApplyKmpEventTest.kt
new file mode 100644
index 00000000..f632bf89
--- /dev/null
+++ b/sentry-kotlin-multiplatform/src/appleTest/kotlin/io/sentry/kotlin/multiplatform/ApplyKmpEventTest.kt
@@ -0,0 +1,37 @@
+package io.sentry.kotlin.multiplatform
+
+import io.sentry.kotlin.multiplatform.extensions.applyKmpEvent
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class ApplyKmpEventTest {
+    @Test
+    fun `null kmp event values should not override the cocoa event values`() {
+        val initialUser = CocoaUser().apply { userId = "testUser" }
+        val initialMessage = CocoaMessage().apply { message = "testMessage" }
+        val cocoaEvent = CocoaSentryEvent().apply {
+            level = 1.toUInt()
+            platform = "cocoa"
+            releaseName = "1.0.0"
+            message = initialMessage
+            logger = "testLogger"
+            environment = "production"
+            user = initialUser
+            serverName = "testServer"
+            dist = "dist1"
+        }
+        val kmpEvent = SentryEvent() // All properties are null by default
+
+        val result = cocoaEvent.applyKmpEvent(kmpEvent)
+
+        assertEquals(1.toUInt(), result.level)
+        assertEquals("cocoa", result.platform)
+        assertEquals("1.0.0", result.releaseName)
+        assertEquals(initialMessage.message, result.message?.message)
+        assertEquals("testLogger", result.logger)
+        assertEquals("production", result.environment)
+        assertEquals(initialUser.userId, result.user?.userId)
+        assertEquals("testServer", result.serverName)
+        assertEquals("dist1", result.dist)
+    }
+}
diff --git a/sentry-kotlin-multiplatform/src/commonJvmMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.jvm.kt b/sentry-kotlin-multiplatform/src/commonJvmMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.jvm.kt
index ca228ced..d0aab8a1 100644
--- a/sentry-kotlin-multiplatform/src/commonJvmMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.jvm.kt
+++ b/sentry-kotlin-multiplatform/src/commonJvmMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.jvm.kt
@@ -5,17 +5,17 @@ import io.sentry.kotlin.multiplatform.JvmSentryId
 import io.sentry.kotlin.multiplatform.SentryEvent
 
 internal fun JvmSentryEvent.applyKmpEvent(kmpEvent: SentryEvent): JvmSentryEvent {
-    level = kmpEvent.level?.toJvmSentryLevel()
-    message = kmpEvent.message?.toJvmMessage()
-    logger = kmpEvent.logger
+    kmpEvent.level?.let { level = it.toJvmSentryLevel() }
+    kmpEvent.message?.let { message = it.toJvmMessage() }
+    kmpEvent.logger?.let { logger = it }
+    kmpEvent.release?.let { release = it }
+    kmpEvent.environment?.let { environment = it }
+    kmpEvent.platform?.let { platform = it }
+    kmpEvent.user?.let { user = it.toJvmUser() }
+    kmpEvent.serverName?.let { serverName = it }
+    kmpEvent.dist?.let { dist = it }
     fingerprints = kmpEvent.fingerprint
-    release = kmpEvent.release
-    environment = kmpEvent.environment
-    platform = kmpEvent.platform
-    user = kmpEvent.user?.toJvmUser()
-    serverName = kmpEvent.serverName
-    dist = kmpEvent.dist
-    breadcrumbs = kmpEvent.breadcrumbs?.map { it.toJvmBreadcrumb() }
+    breadcrumbs = kmpEvent.breadcrumbs.map { it.toJvmBreadcrumb() }
     eventId = JvmSentryId(kmpEvent.eventId.toString())
     tags = kmpEvent.tags
     return this
diff --git a/sentry-kotlin-multiplatform/src/commonJvmTest/kotlin/io/sentry/kotlin/multiplatform/ApplyKmpEventTest.kt b/sentry-kotlin-multiplatform/src/commonJvmTest/kotlin/io/sentry/kotlin/multiplatform/ApplyKmpEventTest.kt
new file mode 100644
index 00000000..b0056d95
--- /dev/null
+++ b/sentry-kotlin-multiplatform/src/commonJvmTest/kotlin/io/sentry/kotlin/multiplatform/ApplyKmpEventTest.kt
@@ -0,0 +1,37 @@
+package io.sentry.kotlin.multiplatform
+
+import io.sentry.kotlin.multiplatform.extensions.applyKmpEvent
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class ApplyKmpEventTest {
+    @Test
+    fun `null kmp event values should not override the Jvm event values`() {
+        val initialUser = JvmUser().apply { id = "testUser" }
+        val initialMessage = JvmMessage().apply { message = "testMessage" }
+        val jvmEvent = JvmSentryEvent().apply {
+            level = JvmSentryLevel.FATAL
+            platform = "Jvm"
+            release = "1.0.0"
+            message = initialMessage
+            logger = "testLogger"
+            environment = "production"
+            user = initialUser
+            serverName = "testServer"
+            dist = "dist1"
+        }
+        val kmpEvent = SentryEvent() // All properties are null by default
+
+        val result = jvmEvent.applyKmpEvent(kmpEvent)
+
+        assertEquals(JvmSentryLevel.FATAL, result.level)
+        assertEquals("Jvm", result.platform)
+        assertEquals("1.0.0", result.release)
+        assertEquals(initialMessage.message, result.message?.message)
+        assertEquals("testLogger", result.logger)
+        assertEquals("production", result.environment)
+        assertEquals(initialUser.id, result.user?.id)
+        assertEquals("testServer", result.serverName)
+        assertEquals("dist1", result.dist)
+    }
+}