diff --git a/.idea/deploymentTargetSelector.xml b/.idea/deploymentTargetSelector.xml
index 596e84c7..347de717 100644
--- a/.idea/deploymentTargetSelector.xml
+++ b/.idea/deploymentTargetSelector.xml
@@ -15,7 +15,7 @@
       </SelectionState>
       <SelectionState runConfigName="playground.app">
         <option name="selectionMode" value="DROPDOWN" />
-        <DropdownSelection timestamp="2024-06-19T21:37:20.486736Z">
+        <DropdownSelection timestamp="2024-09-08T13:50:39.742502Z">
           <Target type="DEFAULT_BOOT">
             <handle>
               <DeviceId pluginId="LocalEmulator" identifier="path=/Users/rafael.costa/.android/avd/Pixel_3a_API_33_arm64-v8a.avd" />
diff --git a/compose-destinations-codegen/src/main/java/com/ramcosta/composedestinations/codegen/CodeGenerator.kt b/compose-destinations-codegen/src/main/java/com/ramcosta/composedestinations/codegen/CodeGenerator.kt
index f97746c6..bee0ce89 100644
--- a/compose-destinations-codegen/src/main/java/com/ramcosta/composedestinations/codegen/CodeGenerator.kt
+++ b/compose-destinations-codegen/src/main/java/com/ramcosta/composedestinations/codegen/CodeGenerator.kt
@@ -1,5 +1,6 @@
 package com.ramcosta.composedestinations.codegen
 
+import com.ramcosta.composedestinations.codegen.commons.RESULT_BACK_NAVIGATOR_QUALIFIED_NAME
 import com.ramcosta.composedestinations.codegen.commons.firstTypeInfoArg
 import com.ramcosta.composedestinations.codegen.commons.isCustomArrayOrArrayListTypeNavArg
 import com.ramcosta.composedestinations.codegen.facades.CodeOutputStreamMaker
@@ -11,6 +12,8 @@ import com.ramcosta.composedestinations.codegen.model.NavTypeSerializer
 import com.ramcosta.composedestinations.codegen.model.RawDestinationGenParams
 import com.ramcosta.composedestinations.codegen.model.RawNavGraphGenParams
 import com.ramcosta.composedestinations.codegen.model.SubModuleInfo
+import com.ramcosta.composedestinations.codegen.model.TypeArgument
+import com.ramcosta.composedestinations.codegen.model.TypeInfo
 import com.ramcosta.composedestinations.codegen.servicelocator.ServiceLocator
 import com.ramcosta.composedestinations.codegen.servicelocator.customNavTypeWriter
 import com.ramcosta.composedestinations.codegen.servicelocator.defaultKtxSerializableNavTypeSerializerWriter
@@ -98,23 +101,25 @@ class CodeGenerator(
 
     private fun shouldWriteKtxSerializableNavTypeSerializer(
         destinations: List<CodeGenProcessedDestination>,
-    ) = destinations.any {
-        it.navArgs.any { navArg ->
-            if (navArg.type.isCustomArrayOrArrayListTypeNavArg()) {
-               navArg.type.value.firstTypeInfoArg.run {
-                   isKtxSerializable &&
-                           !hasCustomTypeSerializer &&
-                           !isParcelable &&
-                           !isSerializable
-               }
-            } else {
-                navArg.type.run {
-                    isKtxSerializable &&
-                            !hasCustomTypeSerializer &&
-                            !isParcelable &&
-                            !isSerializable
+    ): Boolean {
+        return destinations.any { destination ->
+            val hasKtxSerializableNavArgs = destination.navArgs.any { navArg ->
+                if (navArg.type.isCustomArrayOrArrayListTypeNavArg()) {
+                    navArg.type.value.firstTypeInfoArg.needsToUseKtxSerializable()
+                } else {
+                    navArg.type.needsToUseKtxSerializable()
                 }
             }
+
+            val hasKtxSerializableResultBackTypes = destination.parameters
+                .firstOrNull { it.type.importable.qualifiedName == RESULT_BACK_NAVIGATOR_QUALIFIED_NAME }
+                ?.type?.value
+                ?.typeArguments?.first()?.let { (it as? TypeArgument.Typed)?.type }
+                ?.needsToUseKtxSerializable() ?: false
+
+            hasKtxSerializableNavArgs || hasKtxSerializableResultBackTypes
         }
     }
+
+    private fun TypeInfo.needsToUseKtxSerializable() = isKtxSerializable && !hasCustomTypeSerializer && !isParcelable && !isSerializable
 }
diff --git a/compose-destinations-codegen/src/main/java/com/ramcosta/composedestinations/codegen/validators/InitialValidator.kt b/compose-destinations-codegen/src/main/java/com/ramcosta/composedestinations/codegen/validators/InitialValidator.kt
index bfe2e7e9..4870be2b 100644
--- a/compose-destinations-codegen/src/main/java/com/ramcosta/composedestinations/codegen/validators/InitialValidator.kt
+++ b/compose-destinations-codegen/src/main/java/com/ramcosta/composedestinations/codegen/validators/InitialValidator.kt
@@ -208,7 +208,7 @@ internal class InitialValidator(
                 ?: throw IllegalDestinationsSetup(
                     "ResultRecipient second type argument must be a valid type with no '*' variance."
                 )
-            validateResultType(resultType)
+            validateResultType(resultType, parameter.type.toTypeCode())
 
             val resultOriginQualifiedName = parameter.getFirstArgTypeQualifiedName()
 
@@ -262,6 +262,17 @@ internal class InitialValidator(
                         "Destination annotated Composables must have at most one ResultBackNavigator"
             )
         }
+
+        resultBackNavigatorParams.forEach { parameter ->
+            val resultType =
+                (parameter.type.typeArguments.firstOrNull() as? TypeArgument.Typed?)?.type
+                    ?: throw IllegalDestinationsSetup(
+                        "Composable '${annotatedName}': " +
+                            "ResultBackNavigator type argument must be a valid type with no type arguments."
+                    )
+
+            validateResultType(resultType, parameter.type.toTypeCode())
+        }
     }
 
     private fun DestinationGeneratingParams.validateOpenResultRecipients() {
@@ -272,10 +283,11 @@ internal class InitialValidator(
             val resultType =
                 (parameter.type.typeArguments.firstOrNull() as? TypeArgument.Typed?)?.type
                     ?: throw IllegalDestinationsSetup(
-                        "OpenResultRecipient type argument must be a valid type with no type arguments."
+                        "Composable '${annotatedName}': " +
+                            "OpenResultRecipient type argument must be a valid type with no type arguments."
                     )
 
-            validateResultType(resultType)
+            validateResultType(resultType, parameter.type.toTypeCode())
         }
     }
 
@@ -321,9 +333,9 @@ internal class InitialValidator(
         return (firstTypeArg as? TypeArgument.Typed)?.type?.importable?.qualifiedName
     }
 
-    private fun DestinationGeneratingParams.validateResultType(resultType: TypeInfo) {
+    private fun DestinationGeneratingParams.validateResultType(resultType: TypeInfo, argString: String) {
         if (!resultType.isNavArgType()) {
-            throw IllegalDestinationsSetup("Composable $annotatedName, ${resultType.toTypeCode()}: Result types must be of a valid navigation argument type.")
+            throw IllegalDestinationsSetup("Composable '$annotatedName', $argString: Result types must be of a valid navigation argument type, but was '${resultType.toTypeCode()}'.")
         }
     }
 
diff --git a/playground/app/build.gradle.kts b/playground/app/build.gradle.kts
index d6255e5e..bbc36583 100644
--- a/playground/app/build.gradle.kts
+++ b/playground/app/build.gradle.kts
@@ -50,7 +50,7 @@ android {
 
     // Possible Compose Destinations configs:
     ksp {
-        arg("compose-destinations.debugMode", "$rootDir")
+//        arg("compose-destinations.debugMode", "$rootDir")
 //        // Module name.
 //        // It will be used as the generated sealed Destinations prefix
 //        arg("compose-destinations.moduleName", "featureX")
diff --git a/playground/featurex/build.gradle.kts b/playground/featurex/build.gradle.kts
index 9dc56d30..2e42b8e9 100644
--- a/playground/featurex/build.gradle.kts
+++ b/playground/featurex/build.gradle.kts
@@ -40,7 +40,7 @@ android {
     }
 
     ksp {
-        arg("compose-destinations.debugMode", "$rootDir")
+//        arg("compose-destinations.debugMode", "$rootDir")
         arg("compose-destinations.moduleName", "featureX")
         arg("compose-destinations.htmlMermaidGraph", "$rootDir/playground/docs")
         arg("compose-destinations.mermaidGraph", "$rootDir/playground/docs")
diff --git a/playground/featurey/build.gradle.kts b/playground/featurey/build.gradle.kts
index c5a123e2..d2ebaef5 100644
--- a/playground/featurey/build.gradle.kts
+++ b/playground/featurey/build.gradle.kts
@@ -40,7 +40,7 @@ android {
     }
 
     ksp {
-        arg("compose-destinations.debugMode", "$rootDir")
+//        arg("compose-destinations.debugMode", "$rootDir")
         arg("compose-destinations.moduleName", "featureY")
         arg("compose-destinations.htmlMermaidGraph", "$rootDir/playground/docs")
         arg("compose-destinations.mermaidGraph", "$rootDir/playground/docs")
diff --git a/playground/featurey/sub/build.gradle.kts b/playground/featurey/sub/build.gradle.kts
index 62451487..bb225ee4 100644
--- a/playground/featurey/sub/build.gradle.kts
+++ b/playground/featurey/sub/build.gradle.kts
@@ -40,7 +40,7 @@ android {
     }
 
     ksp {
-        arg("compose-destinations.debugMode", "$rootDir")
+//        arg("compose-destinations.debugMode", "$rootDir")
         arg("compose-destinations.moduleName", "subFeatureY")
         arg("compose-destinations.htmlMermaidGraph", "$rootDir/playground/docs")
         arg("compose-destinations.mermaidGraph", "$rootDir/playground/docs")
diff --git a/playground/featurez/build.gradle.kts b/playground/featurez/build.gradle.kts
index 3621bb12..0cd7430c 100644
--- a/playground/featurez/build.gradle.kts
+++ b/playground/featurez/build.gradle.kts
@@ -40,7 +40,7 @@ android {
     }
 
     ksp {
-        arg("compose-destinations.debugMode", "$rootDir")
+//        arg("compose-destinations.debugMode", "$rootDir")
         arg("compose-destinations.moduleName", "featureZ")
     }
 }