diff --git a/core/js/src/main/scala/canoe/api/clients/AjaxClient.scala b/core/js/src/main/scala/canoe/api/clients/AjaxClient.scala
index 410a4a0d..01f67fb9 100644
--- a/core/js/src/main/scala/canoe/api/clients/AjaxClient.scala
+++ b/core/js/src/main/scala/canoe/api/clients/AjaxClient.scala
@@ -19,14 +19,20 @@ private[api] class AjaxClient[F[_]: Async: ContextShift](token: String) extends
     */
   def execute[Req, Res](request: Req)(implicit M: Method[Req, Res]): F[Res] = {
     implicit val responseDecoder: Decoder[Response[Res]] = Response.decoder[Res](M.decoder)
-    console.log(s"Executing ${M.name}")
 
     sendJsonRequest(request, M).map(decode[Response[Res]]).flatMap {
-      case Left(error)     => ResponseDecodingError(error.toString).raiseError[F, Res]
+      case Left(error)     => handleUnknownEntity(M.name, request, error.getMessage)
       case Right(response) => handleTelegramResponse(M, request)(response)
     }
   }
 
+  private def handleUnknownEntity[I, A](method: String, input: I, error: String): F[A] = {
+    console.error(
+      s"Received unknown Telegram entity during execution of '$method' method. \nInput data: $input. \n${error}"
+    )
+    ResponseDecodingError(error.toString).raiseError[F, A]
+  }
+
   private def handleTelegramResponse[A, I, C](m: Method[I, A], input: I)(response: Response[A]): F[A] =
     response match {
       case Response(true, Some(result), _, _, _) => result.pure[F]
diff --git a/core/shared/src/main/scala/canoe/api/sources/Polling.scala b/core/shared/src/main/scala/canoe/api/sources/Polling.scala
index 8d9abbb2..eef7f5b9 100644
--- a/core/shared/src/main/scala/canoe/api/sources/Polling.scala
+++ b/core/shared/src/main/scala/canoe/api/sources/Polling.scala
@@ -1,11 +1,13 @@
 package canoe.api.sources
 
-import canoe.api.{ResponseDecodingError, UpdateSource}
+import canoe.api.{ResponseDecodingError, UpdateSource, TelegramClient}
 import canoe.methods.updates.GetUpdates
 import canoe.models.Update
 import canoe.syntax.methodOps
 import cats.ApplicativeError
 import cats.effect.Timer
+import cats.syntax.functor.toFunctorOps
+import cats.syntax.applicativeError.catsSyntaxApplicativeError
 import fs2.Stream
 import io.circe.parser.decode