diff --git a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/reflect/proxy/DynamicProxySupport.java b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/reflect/proxy/DynamicProxySupport.java
index 119999247d61..3214fa31836d 100644
--- a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/reflect/proxy/DynamicProxySupport.java
+++ b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/reflect/proxy/DynamicProxySupport.java
@@ -51,7 +51,6 @@
 import com.oracle.svm.core.util.ImageHeapMap;
 import com.oracle.svm.core.util.VMError;
 import com.oracle.svm.util.ClassUtil;
-import com.oracle.svm.util.LogUtils;
 import com.oracle.svm.util.ReflectionUtil;
 
 import jdk.graal.compiler.debug.GraalError;
@@ -156,7 +155,6 @@ private static Object createProxyClass(Class<?>[] interfaces) {
             }
             return clazz;
         } catch (Throwable t) {
-            LogUtils.warning("Could not create a proxy class from list of interfaces: %s. Reason: %s", Arrays.toString(interfaces), t.getMessage());
             return t;
         }
     }
diff --git a/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reflect/proxy/ProxyRegistry.java b/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reflect/proxy/ProxyRegistry.java
index 741c9fa93941..1e283242b2a9 100644
--- a/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reflect/proxy/ProxyRegistry.java
+++ b/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reflect/proxy/ProxyRegistry.java
@@ -28,12 +28,12 @@
 import java.util.function.BiConsumer;
 
 import org.graalvm.nativeimage.impl.ConfigurationCondition;
+import org.graalvm.nativeimage.impl.RuntimeProxyRegistrySupport;
 
 import com.oracle.svm.core.jdk.proxy.DynamicProxyRegistry;
 import com.oracle.svm.hosted.ConditionalConfigurationRegistry;
 import com.oracle.svm.hosted.ImageClassLoader;
 import com.oracle.svm.util.LogUtils;
-import org.graalvm.nativeimage.impl.RuntimeProxyRegistrySupport;
 
 public class ProxyRegistry extends ConditionalConfigurationRegistry implements RuntimeProxyRegistrySupport, BiConsumer<ConfigurationCondition, List<String>> {
     private final DynamicProxyRegistry dynamicProxySupport;
@@ -57,7 +57,12 @@ public Class<?> registerProxy(ConfigurationCondition condition, Class<?>... inte
         abortIfSealed();
         requireNonNull(interfaces, "interface", "proxy class creation");
         registerConditionalConfiguration(condition, (cnd) -> dynamicProxySupport.addProxyClass(cnd, interfaces));
-        return dynamicProxySupport.getProxyClassHosted(interfaces);
+        try {
+            return dynamicProxySupport.getProxyClassHosted(interfaces);
+        } catch (Throwable t) {
+            /* we return null for illegal proxy classes */
+            return null;
+        }
     }
 
     public Class<?> createProxyClassForSerialization(List<String> proxies) {
diff --git a/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reflect/serialize/SerializationFeature.java b/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reflect/serialize/SerializationFeature.java
index 6a9615c6cbc4..327607ce749a 100644
--- a/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reflect/serialize/SerializationFeature.java
+++ b/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reflect/serialize/SerializationFeature.java
@@ -385,8 +385,12 @@ public void registerLambdaCapturingClass(ConfigurationCondition condition, Strin
     public void registerProxyClass(ConfigurationCondition condition, List<String> implementedInterfaces) {
         abortIfSealed();
         registerConditionalConfiguration(condition, (cnd) -> {
-            Class<?> proxyClass = proxyRegistry.createProxyClassForSerialization(implementedInterfaces);
-            register(cnd, proxyClass);
+            try {
+                Class<?> proxyClass = proxyRegistry.createProxyClassForSerialization(implementedInterfaces);
+                register(cnd, proxyClass);
+            } catch (IllegalArgumentException t) {
+                /* ignore: can't serialize class that can't be instantiated */
+            }
         });
     }