diff --git a/build.gradle.kts b/build.gradle.kts
index 52c988f..cee5e1d 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -6,7 +6,7 @@ plugins {
 }
 
 group = "com.mapk"
-version = "0.13"
+version = "0.14"
 
 java {
     sourceCompatibility = JavaVersion.VERSION_1_8
diff --git a/src/main/kotlin/com/mapk/core/ArgumentAdaptor.kt b/src/main/kotlin/com/mapk/core/ArgumentAdaptor.kt
index b011f1c..af561d7 100644
--- a/src/main/kotlin/com/mapk/core/ArgumentAdaptor.kt
+++ b/src/main/kotlin/com/mapk/core/ArgumentAdaptor.kt
@@ -13,7 +13,22 @@ class ArgumentAdaptor(private val requiredParameters: Map<String, ValueParameter
     }
 
     fun putIfAbsent(key: String, value: Any?) {
-        if (!isInitialized(key) && !(!requiredParameters.getValue(key).isNullable && value == null)) {
+        if (!isInitialized(key) && (value != null || requiredParameters.getValue(key).isNullable)) {
+            argumentMap[key] = value
+        }
+    }
+
+    fun putIfAbsent(key: String, consumer: () -> Any?) {
+        if (isInitialized(key)) return
+
+        val value = consumer()
+        if (value != null || requiredParameters.getValue(key).isNullable) {
+            argumentMap[key] = value
+        }
+    }
+
+    fun forcePut(key: String, value: Any?) {
+        if (value != null || requiredParameters.getValue(key).isNullable) {
             argumentMap[key] = value
         }
     }