I used takeIf for conditional judgment, but still encountered the following exception:

java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
                                                                                                        at jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
                                                                                                        at jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
                                                                                                        at jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
                                                                                                        at java.util.Objects.checkIndex(Objects.java:359)
                                                                                                        at java.util.ArrayList.get(ArrayList.java:434)
                                                                                                        at com.minecraft.mc_chat.MainViewModel$callback$1.msgCallback(MainViewModel.kt:213)
                                                                                                        at com.minecraft.mc_chat.nsd.FindBonjourTool$createDiscoverListener$1$onServiceFound$1.onServiceResolved(FindBonjourTool.kt:122)
                                                                                                        at android.net.nsd.NsdManager$ServiceHandler.lambda$handleMessage$11(NsdManager.java:1029)
                                                                                                        at android.net.nsd.NsdManager$ServiceHandler$$ExternalSyntheticLambda2.run(Unknown Source:4)
                                                                                                        at android.net.nsd.NsdManager$$ExternalSyntheticLambda2.execute(Unknown Source:0)
                                                                                                        at android.net.nsd.NsdManager$ServiceHandler.handleMessage(NsdManager.java:1029)
                                                                                                        at android.os.Handler.dispatchMessage(Handler.java:106)
                                                                                                        at android.os.Looper.loopOnce(Looper.java:230)
                                                                                                        at android.os.Looper.loop(Looper.java:319)
                                                                                                        at android.os.HandlerThread.run(HandlerThread.java:67)

I don’t know why this happened, was it because I used takeIf incorrectly？

list.takeIf { it.size == 1 }?.let {
                stopScan()
                val ip = it[0].host.hostAddress
                startChatClient(ip, port)
                return
            }

If the condition is false, then the subsequent code will not be executed, why do exceptions still occur？

If there is a correct method, please let me know