diff --git a/src/main/kotlin/io/kuzzle/sdk/Kuzzle.kt b/src/main/kotlin/io/kuzzle/sdk/Kuzzle.kt
index 6b0524d0..66279c50 100644
--- a/src/main/kotlin/io/kuzzle/sdk/Kuzzle.kt
+++ b/src/main/kotlin/io/kuzzle/sdk/Kuzzle.kt
@@ -65,7 +65,7 @@ open class Kuzzle {
 
     private fun onMessageReceived(event: MessageReceivedEvent) {
         val message = event.message
-        val jsonObject: Map<String?, Any?>
+        var jsonObject: Map<String?, Any?>
         try {
             jsonObject = JsonSerializer.deserialize(message) as Map<String?, Any?>
         } catch (e: Exception) {
@@ -77,6 +77,13 @@ open class Kuzzle {
             }
             return
         }
+
+        // If the message is empty, we take the requestId of the event,
+        // to avoid error in fromMap function.
+        if (! jsonObject.containsKey("requestId") && event.requestId != null) {
+            jsonObject = jsonObject.plus("requestId" to event.requestId)
+        }
+
         val response = Response().apply {
             fromMap(jsonObject)
         }
diff --git a/src/main/kotlin/io/kuzzle/sdk/controllers/RealtimeController.kt b/src/main/kotlin/io/kuzzle/sdk/controllers/RealtimeController.kt
index 2db8f9f5..fc45925e 100644
--- a/src/main/kotlin/io/kuzzle/sdk/controllers/RealtimeController.kt
+++ b/src/main/kotlin/io/kuzzle/sdk/controllers/RealtimeController.kt
@@ -25,7 +25,7 @@ class RealtimeController(kuzzle: Kuzzle) : BaseController(kuzzle) {
     )
 
     init {
-        kuzzle.protocol.addListener<UnhandledResponseEvent>() {
+        kuzzle.protocol.addListener<UnhandledResponseEvent> {
             val response = Response().apply {
                 fromMap(JsonSerializer.deserialize(it.message) as Map<String?, Any?>)
             }
@@ -50,7 +50,7 @@ class RealtimeController(kuzzle: Kuzzle) : BaseController(kuzzle) {
             }
         }
 
-        kuzzle.protocol.addListener<NetworkStateChangeEvent>() {
+        kuzzle.protocol.addListener<NetworkStateChangeEvent> {
             if (it.state == ProtocolState.CLOSE) {
                 currentSubscriptions.clear()
             }
diff --git a/src/main/kotlin/io/kuzzle/sdk/coreClasses/http/Route.kt b/src/main/kotlin/io/kuzzle/sdk/coreClasses/http/Route.kt
index 404f203d..11c82879 100644
--- a/src/main/kotlin/io/kuzzle/sdk/coreClasses/http/Route.kt
+++ b/src/main/kotlin/io/kuzzle/sdk/coreClasses/http/Route.kt
@@ -1,6 +1,7 @@
 package io.kuzzle.sdk.coreClasses.http
 
 import io.kuzzle.sdk.coreClasses.exceptions.MissingURLParamException
+import io.kuzzle.sdk.coreClasses.json.JsonSerializer
 import io.kuzzle.sdk.coreClasses.maps.KuzzleMap
 import io.kuzzle.sdk.coreClasses.serializer.StringSerializer
 import java.net.URLEncoder
@@ -63,7 +64,6 @@ class Route {
      */
     fun buildRequest(request: KuzzleMap): HttpRequest {
         val headers = request.optMap("headers", KuzzleMap())
-
         val queryArgs = KuzzleMap()
         for (key: String? in request.keys) {
             // Skip if a key or value is null
@@ -78,7 +78,13 @@ class Route {
                 "headers" -> headers.putAll(request.optMap("headers", KuzzleMap()))
                 "body" -> {
                     if (verb == "GET") {
-                        queryArgs.putAll(request.optMap("body", KuzzleMap()))
+                        var body = request["body"]
+                        if (body != null) {
+                            if (body !is Map<*, *>) {
+                                body = JsonSerializer.deserialize(JsonSerializer.serialize(body))
+                            }
+                            queryArgs.putAll(body as Map<String?, Any?>)
+                        }
                     }
                 }
                 else -> {
@@ -88,7 +94,6 @@ class Route {
                 }
             }
         }
-
         /**
          * Build the query string
          */
@@ -113,7 +118,7 @@ class Route {
             return HttpRequest(
                 verb,
                 if (queryArgs.isEmpty()) staticURL else "$staticURL?$queryString",
-                if (verb != "GET") request.optMap("body", KuzzleMap()) else null,
+                if (verb != "GET") getBody(request) else null,
                 headers
             )
         }
@@ -138,11 +143,26 @@ class Route {
         return HttpRequest(
             verb,
             if (queryArgs.isEmpty()) urlBuilder.toString() else "$urlBuilder?$queryString",
-            if (verb != "GET") request.optMap("body", KuzzleMap()) else null,
+            if (verb != "GET") getBody(request) else null,
             headers
         )
     }
 
+    private fun getBody(request: KuzzleMap): KuzzleMap {
+        return when (val body = request["body"]) {
+            null -> {
+                KuzzleMap()
+            }
+            // If it's not a map, it can be a RawJson or Serializable object.
+            !is Map<*, *> -> {
+                KuzzleMap.from(JsonSerializer.deserialize(JsonSerializer.serialize(body)) as Map<String?, Any?>)
+            }
+            else -> {
+                KuzzleMap.from(body as Map<String?, Any?>)
+            }
+        }
+    }
+
     companion object {
         /**
          * Parse Kuzzle url with the format /:index/:collection
diff --git a/src/main/kotlin/io/kuzzle/sdk/coreClasses/json/JsonSerializer.kt b/src/main/kotlin/io/kuzzle/sdk/coreClasses/json/JsonSerializer.kt
index 80f66889..a52c52c6 100644
--- a/src/main/kotlin/io/kuzzle/sdk/coreClasses/json/JsonSerializer.kt
+++ b/src/main/kotlin/io/kuzzle/sdk/coreClasses/json/JsonSerializer.kt
@@ -3,11 +3,16 @@ package io.kuzzle.sdk.coreClasses.json
 import com.google.gson.Gson
 import com.google.gson.GsonBuilder
 import io.kuzzle.sdk.coreClasses.RequestPayload
+import io.kuzzle.sdk.coreClasses.maps.KuzzleMap
 
 object JsonSerializer {
     private var gson: Gson? = null
     fun deserialize(rawJson: String?): Map<*, *> {
-        return gson!!.fromJson(rawJson, Map::class.java)
+        return if (rawJson == null || rawJson.isBlank()) {
+            KuzzleMap()
+        } else {
+            gson!!.fromJson(rawJson, Map::class.java)
+        }
     }
 
     fun serialize(obj: Any): String {
diff --git a/src/main/kotlin/io/kuzzle/sdk/coreClasses/maps/KuzzleMap.kt b/src/main/kotlin/io/kuzzle/sdk/coreClasses/maps/KuzzleMap.kt
index 57a4f0b0..3bd7339d 100644
--- a/src/main/kotlin/io/kuzzle/sdk/coreClasses/maps/KuzzleMap.kt
+++ b/src/main/kotlin/io/kuzzle/sdk/coreClasses/maps/KuzzleMap.kt
@@ -9,7 +9,7 @@ class KuzzleMap : HashMap<String?, Any?> {
     /**
      * Create a new instance of CustomMap
      */
-    constructor() : super() {}
+    constructor() : super()
 
     /**
      * Create a new instance of CustomMap from a Map<String></String>,