diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1267478f..1a32805b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@
 
 - feat: automatically disable `io.sentry.auto-init` ([#93](https://github.com/getsentry/sentry-kotlin-multiplatform/pull/93))
 
+### Fixes
+
+- fix: NSNumber to Kotlin Long crash during SentryException conversion ([#92](https://github.com/getsentry/sentry-kotlin-multiplatform/pull/92))
+
 ### Improvements
 
 - ref: improve samples & add SPM docs ([#82](https://github.com/getsentry/sentry-kotlin-multiplatform/pull/82))
diff --git a/sentry-kotlin-multiplatform/src/commonAppleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.kt b/sentry-kotlin-multiplatform/src/commonAppleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.kt
index 94674881..73e6d8f3 100644
--- a/sentry-kotlin-multiplatform/src/commonAppleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.kt
+++ b/sentry-kotlin-multiplatform/src/commonAppleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryEventExtensions.kt
@@ -15,8 +15,8 @@ internal fun CocoaSentryEvent.applyKmpEvent(kmpEvent: SentryEvent): CocoaSentryE
     user = kmpEvent.user?.toCocoaUser()
     serverName = kmpEvent.serverName
     dist = kmpEvent.dist
-    breadcrumbs = kmpEvent.breadcrumbs?.map { it.toCocoaBreadcrumb() }?.toMutableList()
-    tags = kmpEvent.tags?.toMutableMap()
+    breadcrumbs = kmpEvent.breadcrumbs.map { it.toCocoaBreadcrumb() }.toMutableList()
+    tags = kmpEvent.tags.toMutableMap()
     eventId = SentryId(kmpEvent.eventId.toString())
     return this
 }
diff --git a/sentry-kotlin-multiplatform/src/commonAppleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryExceptionExtensions.kt b/sentry-kotlin-multiplatform/src/commonAppleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryExceptionExtensions.kt
index 8308d12d..d811f745 100644
--- a/sentry-kotlin-multiplatform/src/commonAppleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryExceptionExtensions.kt
+++ b/sentry-kotlin-multiplatform/src/commonAppleMain/kotlin/io/sentry/kotlin/multiplatform/extensions/SentryExceptionExtensions.kt
@@ -7,5 +7,5 @@ internal fun CocoaSentryException.toKmpSentryException() = SentryException(
     type = type,
     value = value,
     module = module,
-    threadId = threadId as Long?
+    threadId = threadId?.longLongValue // longLong represents a 64-bit integer like Kotlin Long
 )
diff --git a/sentry-kotlin-multiplatform/src/commonAppleTest/kotlin/io/sentry/kotlin/multiplatform/FoundationTest.kt b/sentry-kotlin-multiplatform/src/commonAppleTest/kotlin/io/sentry/kotlin/multiplatform/FoundationTest.kt
index f71ddf37..459ed529 100644
--- a/sentry-kotlin-multiplatform/src/commonAppleTest/kotlin/io/sentry/kotlin/multiplatform/FoundationTest.kt
+++ b/sentry-kotlin-multiplatform/src/commonAppleTest/kotlin/io/sentry/kotlin/multiplatform/FoundationTest.kt
@@ -2,6 +2,7 @@ package io.sentry.kotlin.multiplatform
 
 import io.sentry.kotlin.multiplatform.extensions.toByteArray
 import io.sentry.kotlin.multiplatform.extensions.toNSData
+import platform.Foundation.NSNumber
 import platform.Foundation.NSString
 import platform.Foundation.NSUTF8StringEncoding
 import platform.Foundation.dataUsingEncoding
@@ -24,4 +25,25 @@ class FoundationTest {
         assertEquals(nsData, byteArray.toNSData())
         assertEquals(nsData, nsData.toByteArray().toNSData())
     }
+
+    @Test
+    fun `NSNumber longLong converts to Long correctly`() {
+        val longValue = 4937446359977427944L
+        val nsNumber = NSNumber(longLong = longValue)
+        assertEquals(longValue, nsNumber.longLongValue)
+    }
+
+    @Test
+    fun `NSNumber int converts to Long correctly`() {
+        val intValue = 493744635
+        val nsNumber = NSNumber(int = intValue)
+        assertEquals(intValue.toLong(), nsNumber.longLongValue)
+    }
+
+    @Test
+    fun `NSNumber short converts to Long correctly`() {
+        val shortValue: Short = 4937
+        val nsNumber = NSNumber(short = shortValue)
+        assertEquals(shortValue.toLong(), nsNumber.longLongValue)
+    }
 }
diff --git a/sentry-kotlin-multiplatform/src/commonAppleTest/kotlin/io/sentry/kotlin/multiplatform/SentryExceptionTest.kt b/sentry-kotlin-multiplatform/src/commonAppleTest/kotlin/io/sentry/kotlin/multiplatform/SentryExceptionTest.kt
new file mode 100644
index 00000000..fbcf2037
--- /dev/null
+++ b/sentry-kotlin-multiplatform/src/commonAppleTest/kotlin/io/sentry/kotlin/multiplatform/SentryExceptionTest.kt
@@ -0,0 +1,64 @@
+package io.sentry.kotlin.multiplatform
+
+import io.sentry.kotlin.multiplatform.extensions.toKmpSentryException
+import io.sentry.kotlin.multiplatform.protocol.SentryException
+import kotlinx.cinterop.convert
+import platform.Foundation.NSNumber
+import kotlin.test.Test
+
+class SentryExceptionTest {
+    private val value = "testValue"
+    private val type = "type"
+    private val threadId = 1
+
+    private fun getCocoaSentryException(): CocoaSentryException {
+        return CocoaSentryException(value = value, type = type)
+    }
+
+    private fun getKmpSentryException(threadId: Long? = this.threadId.toLong()): SentryException {
+        return SentryException(value = value, type = type, threadId = threadId)
+    }
+
+    @Test
+    fun `SentryException ThreadId NSNumber long conversion`() {
+        val cocoaSentryException = getCocoaSentryException().apply {
+            threadId = NSNumber(long = this@SentryExceptionTest.threadId.convert())
+        }
+        val sentryException = getKmpSentryException()
+        assert(cocoaSentryException.toKmpSentryException() == sentryException)
+    }
+
+    @Test
+    fun `SentryException ThreadId NSNumber longLong conversion`() {
+        val cocoaSentryException = getCocoaSentryException().apply {
+            threadId = NSNumber(longLong = this@SentryExceptionTest.threadId.convert())
+        }
+        val sentryException = getKmpSentryException()
+        assert(cocoaSentryException.toKmpSentryException() == sentryException)
+    }
+
+    @Test
+    fun `SentryException ThreadId NSNumber int conversion`() {
+        val cocoaSentryException = getCocoaSentryException().apply {
+            threadId = NSNumber(int = this@SentryExceptionTest.threadId.convert())
+        }
+        val sentryException = getKmpSentryException()
+        assert(cocoaSentryException.toKmpSentryException() == sentryException)
+    }
+
+    @Test
+    fun `SentryException ThreadId NSNumber short conversion`() {
+        val cocoaSentryException = getCocoaSentryException().apply {
+            threadId = NSNumber(short = this@SentryExceptionTest.threadId.convert())
+        }
+        val sentryException = getKmpSentryException()
+        assert(cocoaSentryException.toKmpSentryException() == sentryException)
+    }
+
+    @Test
+    fun `SentryException ThreadId NSNumber null conversion`() {
+        val cocoaSentryException = getCocoaSentryException()
+        val sentryException = getKmpSentryException(threadId = null)
+        assert(cocoaSentryException.toKmpSentryException() == sentryException)
+    }
+}