diff --git a/backend/src/main/kotlin/plugins/Routing.kt b/backend/src/main/kotlin/plugins/Routing.kt
index f56e1ba..a31e282 100644
--- a/backend/src/main/kotlin/plugins/Routing.kt
+++ b/backend/src/main/kotlin/plugins/Routing.kt
@@ -3,6 +3,7 @@ package dev.svitan.plugins
 import dev.svitan.routes.routeAuth
 import io.ktor.http.*
 import io.ktor.server.application.*
+import io.ktor.server.plugins.NotFoundException
 import io.ktor.server.plugins.requestvalidation.*
 import io.ktor.server.plugins.statuspages.*
 import io.ktor.server.response.*
@@ -20,7 +21,22 @@ fun Application.configureRouting() {
 
     install(StatusPages) {
         exception<Throwable> { call, cause ->
-            call.respondText(text = "500: $cause", status = HttpStatusCode.InternalServerError)
+            when (cause) {
+                is IllegalArgumentException -> call.respond(
+                    status = HttpStatusCode.BadRequest,
+                    message = cause.message!!
+                )
+
+                is NotFoundException -> call.respond(
+                    status = HttpStatusCode.NotFound,
+                    message = cause.message ?: ""
+                )
+
+                else -> call.respond(
+                    status = HttpStatusCode.InternalServerError,
+                    message = cause.message ?: ""
+                )
+            }
         }
     }
 
diff --git a/backend/src/main/kotlin/routes/Auth.kt b/backend/src/main/kotlin/routes/Auth.kt
index e622fc5..7546ec1 100644
--- a/backend/src/main/kotlin/routes/Auth.kt
+++ b/backend/src/main/kotlin/routes/Auth.kt
@@ -5,6 +5,7 @@ import dev.svitan.schemas.NewAuthDTO
 import io.ktor.http.HttpStatusCode
 import io.ktor.server.application.Application
 import io.ktor.server.auth.authentication
+import io.ktor.server.plugins.BadRequestException
 import io.ktor.server.plugins.NotFoundException
 import io.ktor.server.request.receive
 import io.ktor.server.response.respond
@@ -24,14 +25,14 @@ fun Application.routeAuth() {
             }
 
             get("/auth/{id}") {
-                val idRaw = call.parameters["id"] ?: throw IllegalArgumentException("Invalid id")
+                val idRaw = call.parameters["id"] ?: throw BadRequestException("Invalid id")
                 val id = UUID.fromString(idRaw)
                 val auth = AuthService.read(id) ?: throw NotFoundException()
                 call.respond(auth)
             }
 
             delete("/auth/{id}") {
-                val idRaw = call.parameters["id"] ?: throw IllegalArgumentException("Invalid id")
+                val idRaw = call.parameters["id"] ?: throw BadRequestException("Invalid id")
                 val id = UUID.fromString(idRaw)
                 AuthService.delete(id)
                 call.respond(HttpStatusCode.NoContent)
diff --git a/backend/src/main/kotlin/schemas/Action.kt b/backend/src/main/kotlin/schemas/Action.kt
index 968eab3..d59ea7e 100644
--- a/backend/src/main/kotlin/schemas/Action.kt
+++ b/backend/src/main/kotlin/schemas/Action.kt
@@ -1,5 +1,6 @@
 package dev.svitan.schemas
 
+import io.ktor.server.plugins.NotFoundException
 import kotlinx.serialization.Serializable
 import org.jetbrains.exposed.sql.*
 import org.jetbrains.exposed.sql.SqlExpressionBuilder.eq
@@ -65,7 +66,7 @@ class ActionService {
         fun create(action: NewActionDTO): UUID = transaction {
             val now = LocalDateTime.now().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
             val authId = UUID.fromString(action.authId)
-            AuthService.read(authId) ?: throw Exception("auth not found")
+            AuthService.read(authId) ?: throw NotFoundException("auth not found")
 
             Actions.insert {
                 it[name] = action.name