diff --git a/realtimedb/src/main/kotlin/de/sipgate/federmappe/realtimedb/DummyDataNormalizer.kt b/common/src/main/kotlin/de/sipgate/federmappe/common/decoder/DummyDataNormalizer.kt
similarity index 55%
rename from realtimedb/src/main/kotlin/de/sipgate/federmappe/realtimedb/DummyDataNormalizer.kt
rename to common/src/main/kotlin/de/sipgate/federmappe/common/decoder/DummyDataNormalizer.kt
index a147f38..539c57d 100644
--- a/realtimedb/src/main/kotlin/de/sipgate/federmappe/realtimedb/DummyDataNormalizer.kt
+++ b/common/src/main/kotlin/de/sipgate/federmappe/common/decoder/DummyDataNormalizer.kt
@@ -1,6 +1,4 @@
-package de.sipgate.federmappe.realtimedb
-
-import de.sipgate.federmappe.common.decoder.DataNormalizer
+package de.sipgate.federmappe.common.decoder
 
 class DummyDataNormalizer : DataNormalizer {
     override fun normalize(data: Map<String, Any?>): Map<String, Any?> = data
diff --git a/common/src/main/kotlin/de/sipgate/federmappe/common/decoder/StringMapToObjectDecoder.kt b/common/src/main/kotlin/de/sipgate/federmappe/common/decoder/StringMapToObjectDecoder.kt
index 7fb4aa8..255a9d9 100644
--- a/common/src/main/kotlin/de/sipgate/federmappe/common/decoder/StringMapToObjectDecoder.kt
+++ b/common/src/main/kotlin/de/sipgate/federmappe/common/decoder/StringMapToObjectDecoder.kt
@@ -19,7 +19,7 @@ class StringMapToObjectDecoder(
     private val data: Map<String, Any?>,
     override val serializersModule: SerializersModule = EmptySerializersModule(),
     private val ignoreUnknownProperties: Boolean = false,
-    private val dataNormalizer: DataNormalizer
+    private val dataNormalizer: DataNormalizer = DummyDataNormalizer()
 ) : AbstractDecoder(), TypeAwareDecoder {
     private val keysIterator = data.sortByPrio().keys.iterator()
     private var index: Int? = null
diff --git a/realtimedb/src/main/kotlin/de/sipgate/federmappe/realtimedb/DataSnapshotExt.kt b/realtimedb/src/main/kotlin/de/sipgate/federmappe/realtimedb/DataSnapshotExt.kt
index b61c98e..c7fd5f7 100644
--- a/realtimedb/src/main/kotlin/de/sipgate/federmappe/realtimedb/DataSnapshotExt.kt
+++ b/realtimedb/src/main/kotlin/de/sipgate/federmappe/realtimedb/DataSnapshotExt.kt
@@ -3,6 +3,7 @@ package de.sipgate.federmappe.realtimedb
 import com.google.firebase.database.DataSnapshot
 import de.sipgate.federmappe.common.ErrorHandler
 import de.sipgate.federmappe.common.decoder.DataNormalizer
+import de.sipgate.federmappe.common.decoder.DummyDataNormalizer
 import de.sipgate.federmappe.common.toObjectWithSerializer
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.modules.EmptySerializersModule