diff --git a/src/com/android/settings/network/telephony/CallStateRepository.kt b/src/com/android/settings/network/telephony/CallStateRepository.kt
index 1c93af32b19..4b6cdc83975 100644
--- a/src/com/android/settings/network/telephony/CallStateRepository.kt
+++ b/src/com/android/settings/network/telephony/CallStateRepository.kt
@@ -26,6 +26,7 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.conflate
 import kotlinx.coroutines.flow.flatMapLatest
+import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.onEach
 
@@ -50,8 +51,12 @@ class CallStateRepository(private val context: Context) {
     fun isInCallFlow(): Flow<Boolean> = context.subscriptionsChangedFlow()
         .flatMapLatest {
             val subIds = subscriptionManager.activeSubscriptionIdList
-            combine(subIds.map(::callStateFlow)) { states ->
-                states.any { it != TelephonyManager.CALL_STATE_IDLE }
+            if (subIds.isEmpty()) {
+                flowOf(false)
+            } else {
+                combine(subIds.map(::callStateFlow)) { states ->
+                    states.any { it != TelephonyManager.CALL_STATE_IDLE }
+                }
             }
         }
         .conflate()
diff --git a/tests/spa_unit/src/com/android/settings/network/telephony/CallStateRepositoryTest.kt b/tests/spa_unit/src/com/android/settings/network/telephony/CallStateRepositoryTest.kt
index 8213ecf4842..55d520fd214 100644
--- a/tests/spa_unit/src/com/android/settings/network/telephony/CallStateRepositoryTest.kt
+++ b/tests/spa_unit/src/com/android/settings/network/telephony/CallStateRepositoryTest.kt
@@ -35,6 +35,7 @@ import org.mockito.kotlin.doAnswer
 import org.mockito.kotlin.doReturn
 import org.mockito.kotlin.mock
 import org.mockito.kotlin.spy
+import org.mockito.kotlin.stub
 
 @RunWith(AndroidJUnit4::class)
 class CallStateRepositoryTest {
@@ -86,6 +87,17 @@ class CallStateRepositoryTest {
             .inOrder()
     }
 
+    @Test
+    fun isInCallFlow_noActiveSubscription() = runBlocking {
+        mockSubscriptionManager.stub {
+            on { activeSubscriptionIdList } doReturn intArrayOf()
+        }
+
+        val isInCall = repository.isInCallFlow().firstWithTimeoutOrNull()
+
+        assertThat(isInCall).isFalse()
+    }
+
     @Test
     fun isInCallFlow_initial() = runBlocking {
         val isInCall = repository.isInCallFlow().firstWithTimeoutOrNull()