diff --git a/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/connections/impl/AppSettingsConnectionProvider.kt b/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/connections/impl/AppSettingsConnectionProvider.kt
index 44824e7..227b0fc 100644
--- a/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/connections/impl/AppSettingsConnectionProvider.kt
+++ b/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/connections/impl/AppSettingsConnectionProvider.kt
@@ -23,7 +23,7 @@ class AppSettingsConnectionProvider(private val intellijProject: Project) : DbCo
 
     override fun getAvailableConnections(project: RdProjectDescriptor) =
         buildList {
-            val directory = (project.location as RdCustomLocation?)?.customLocation?.let(::Path)?.parent ?: return@buildList
+            val directory = (project.location as? RdCustomLocation)?.customLocation?.let(::Path)?.parent ?: return@buildList
             @NonNls
             val connectionStrings = directory.listDirectoryEntries("appsettings*.json")
                 .filter { it.isRegularFile() }
diff --git a/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/connections/impl/JsonConnectionStringsManager.kt b/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/connections/impl/JsonConnectionStringsManager.kt
index cd608cb..5b8c5e3 100644
--- a/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/connections/impl/JsonConnectionStringsManager.kt
+++ b/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/connections/impl/JsonConnectionStringsManager.kt
@@ -32,9 +32,9 @@ class JsonConnectionStringsManager(intellijProject: Project) {
      * }
      */
     private fun getConnectionsFromObject(fileName: String, jsonFile: JsonNode): List<DbConnectionInfo> = buildList {
-        val obj = jsonFile.get("ConnectionStrings") as ObjectNode? ?: return emptyList()
+        val obj = jsonFile.get("ConnectionStrings") as? ObjectNode ?: return emptyList()
         obj.fieldNames().forEach { connName ->
-            val connString = (obj[connName] as TextNode?)?.textValue()
+            val connString = (obj[connName] as? TextNode)?.textValue()
             if (connString != null)
                 add(DbConnectionInfo(connName, connString, fileName, null))
         }
@@ -53,7 +53,7 @@ class JsonConnectionStringsManager(intellijProject: Project) {
                 null -> return@forEach
                 else -> {
                     val name = match.groups["name"]?.value ?: return@forEach
-                    val connection = (jsonFile[settingsField] as TextNode?)?.textValue() ?: return@forEach
+                    val connection = (jsonFile[settingsField] as? TextNode)?.textValue() ?: return@forEach
                     add(DbConnectionInfo(name, connection, fileName, null))
                 }
             }
diff --git a/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/shared/services/JsonSerializer.kt b/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/shared/services/JsonSerializer.kt
index 8fccb57..02f9810 100644
--- a/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/shared/services/JsonSerializer.kt
+++ b/src/rider/main/kotlin/com/jetbrains/rider/plugins/efcore/features/shared/services/JsonSerializer.kt
@@ -2,6 +2,7 @@ package com.jetbrains.rider.plugins.efcore.features.shared.services
 
 import com.fasterxml.jackson.core.JacksonException
 import com.fasterxml.jackson.core.JsonParser
+import com.fasterxml.jackson.core.json.JsonReadFeature
 import com.fasterxml.jackson.databind.JsonNode
 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import com.intellij.openapi.components.Service
@@ -17,6 +18,7 @@ class JsonSerializer {
             jacksonObjectMapper()
                 .enable(JsonParser.Feature.ALLOW_COMMENTS)
                 .enable(JsonParser.Feature.ALLOW_SINGLE_QUOTES)
+                .enable(JsonReadFeature.ALLOW_TRAILING_COMMA.mappedFeature())
 
         fun getInstance() = service<JsonSerializer>()
     }