diff --git a/core/src/com/unciv/logic/multiplayer/apiv2/ApiV2.kt b/core/src/com/unciv/logic/multiplayer/apiv2/ApiV2.kt
index 1c6784bd17..cd796bb5d9 100644
--- a/core/src/com/unciv/logic/multiplayer/apiv2/ApiV2.kt
+++ b/core/src/com/unciv/logic/multiplayer/apiv2/ApiV2.kt
@@ -183,7 +183,7 @@ class ApiV2(private val baseUrl: String) : ApiV2Wrapper(baseUrl), Disposable {
                 val b: VersionResponse = r.body()
                 b.version == 2
             }
-        } catch (e: IllegalArgumentException) {
+        } catch (_: IllegalArgumentException) {
             false
         } catch (e: Throwable) {
             Log.error("Unexpected exception calling version endpoint for '$baseUrl': $e")
@@ -204,7 +204,7 @@ class ApiV2(private val baseUrl: String) : ApiV2Wrapper(baseUrl), Disposable {
                 val b: ApiErrorResponse = r.body()
                 b.statusCode == ApiStatusCode.Unauthenticated
             }
-        } catch (e: IllegalArgumentException) {
+        } catch (_: IllegalArgumentException) {
             false
         } catch (e: Throwable) {
             Log.error("Unexpected exception calling WebSocket endpoint for '$baseUrl': $e")
@@ -339,9 +339,7 @@ class ApiV2(private val baseUrl: String) : ApiV2Wrapper(baseUrl), Disposable {
      * This function may also throw arbitrary exceptions for network failures.
      */
     suspend fun awaitPing(size: Int = 2, timeout: Long? = null): Double? {
-        if (size < 2) {
-            throw IllegalArgumentException("Size too small to identify ping responses uniquely")
-        }
+        require(size < 2) { "Size too small to identify ping responses uniquely" }
         val body = ByteArray(size)
         Random().nextBytes(body)
 
@@ -371,7 +369,7 @@ class ApiV2(private val baseUrl: String) : ApiV2Wrapper(baseUrl), Disposable {
                     throw exception
                 }
             }.toDouble() / 10e6
-        } catch (c: ClosedReceiveChannelException) {
+        } catch (_: ClosedReceiveChannelException) {
             return null
         } finally {
             synchronized(this) {
@@ -448,7 +446,7 @@ class ApiV2(private val baseUrl: String) : ApiV2Wrapper(baseUrl), Disposable {
                                         Concurrency.run {
                                             try {
                                                 c.send((msg as WebSocketMessageWithContent).content)
-                                            } catch (closed: ClosedSendChannelException) {
+                                            } catch (_: ClosedSendChannelException) {
                                                 delay(10)
                                                 eventChannelList.remove(c)
                                             } catch (t: Throwable) {
diff --git a/core/src/com/unciv/logic/multiplayer/storage/OnlineMultiplayerServer.kt b/core/src/com/unciv/logic/multiplayer/storage/OnlineMultiplayerServer.kt
index 5d2a962932..98e9975b94 100644
--- a/core/src/com/unciv/logic/multiplayer/storage/OnlineMultiplayerServer.kt
+++ b/core/src/com/unciv/logic/multiplayer/storage/OnlineMultiplayerServer.kt
@@ -50,7 +50,7 @@ class OnlineMultiplayerServer(
             if (result.isNotEmpty()) {
                 featureSet = try {
                     json().fromJson(ServerFeatureSet::class.java, result)
-                } catch (ex: Exception) {
+                } catch (_: Exception) {
                     // The server does not support server feature set - not an error!
                     ServerFeatureSet()
                 }