diff --git a/streams-bootstrap-core/src/main/java/com/bakdata/kafka/ConfiguredConsumed.java b/streams-bootstrap-core/src/main/java/com/bakdata/kafka/ConfiguredConsumed.java
index 12d894b6..ffda6052 100644
--- a/streams-bootstrap-core/src/main/java/com/bakdata/kafka/ConfiguredConsumed.java
+++ b/streams-bootstrap-core/src/main/java/com/bakdata/kafka/ConfiguredConsumed.java
@@ -61,9 +61,17 @@ public static <K, V> ConfiguredConsumed<K, V> as(final String processorName) {
 
     Consumed<K, V> configure(final Configurator configurator) {
         return Consumed.<K, V>as(this.name)
-                .withKeySerde(configurator.configureForKeys(this.keySerde))
-                .withValueSerde(configurator.configureForValues(this.valueSerde))
+                .withKeySerde(this.configureKeySerde(configurator))
+                .withValueSerde(this.configureValueSerde(configurator))
                 .withOffsetResetPolicy(this.offsetResetPolicy)
                 .withTimestampExtractor(this.timestampExtractor);
     }
+
+    private Serde<V> configureValueSerde(final Configurator configurator) {
+        return this.valueSerde == null ? null : configurator.configureForValues(this.valueSerde);
+    }
+
+    private Serde<K> configureKeySerde(final Configurator configurator) {
+        return this.keySerde == null ? null : configurator.configureForKeys(this.keySerde);
+    }
 }
diff --git a/streams-bootstrap-core/src/main/java/com/bakdata/kafka/ConfiguredProduced.java b/streams-bootstrap-core/src/main/java/com/bakdata/kafka/ConfiguredProduced.java
index 49f212a9..62d0d161 100644
--- a/streams-bootstrap-core/src/main/java/com/bakdata/kafka/ConfiguredProduced.java
+++ b/streams-bootstrap-core/src/main/java/com/bakdata/kafka/ConfiguredProduced.java
@@ -59,8 +59,16 @@ public static <K, V> ConfiguredProduced<K, V> as(final String processorName) {
 
     Produced<K, V> configure(final Configurator configurator) {
         return Produced.<K, V>as(this.name)
-                .withKeySerde(configurator.configureForKeys(this.keySerde))
-                .withValueSerde(configurator.configureForValues(this.valueSerde))
+                .withKeySerde(this.configureKeySerde(configurator))
+                .withValueSerde(this.configuredValueSerde(configurator))
                 .withStreamPartitioner(this.streamPartitioner);
     }
+
+    private Serde<V> configuredValueSerde(final Configurator configurator) {
+        return this.valueSerde == null ? null : configurator.configureForValues(this.valueSerde);
+    }
+
+    private Serde<K> configureKeySerde(final Configurator configurator) {
+        return this.keySerde == null ? null : configurator.configureForKeys(this.keySerde);
+    }
 }