diff --git a/extensions/undertow/runtime/src/main/java/io/quarkus/undertow/runtime/KnownPathResourceManager.java b/extensions/undertow/runtime/src/main/java/io/quarkus/undertow/runtime/KnownPathResourceManager.java
index fe426c649bf77..ce374d9255321 100644
--- a/extensions/undertow/runtime/src/main/java/io/quarkus/undertow/runtime/KnownPathResourceManager.java
+++ b/extensions/undertow/runtime/src/main/java/io/quarkus/undertow/runtime/KnownPathResourceManager.java
@@ -16,6 +16,8 @@
 import java.util.SortedSet;
 import java.util.TreeSet;
 
+import org.jboss.logging.Logger;
+
 import io.undertow.httpcore.OutputChannel;
 import io.undertow.server.HttpServerExchange;
 import io.undertow.server.handlers.resource.Resource;
@@ -25,6 +27,8 @@
 
 public class KnownPathResourceManager implements ResourceManager {
 
+    private static final Logger log = Logger.getLogger(KnownPathResourceManager.class);
+
     public static final boolean IS_WINDOWS = System.getProperty("os.name").toLowerCase(Locale.ENGLISH).contains("windows");
 
     private final NavigableSet<String> files;
@@ -144,10 +148,12 @@ public List<Resource> list() {
                             try {
                                 Resource resource = underlying.getResource(i);
                                 if (resource == null) {
-                                    throw new RuntimeException("Unable to get listed resource " + i + " from directory " + path
-                                            + " for path " + slashPath + " from underlying manager " + underlying);
+                                    log.warnv(
+                                            "Unable to get listed resource {0} from directory '{1}' for path '{2}' from underlying manager {3}",
+                                            i, path, slashPath, underlying);
+                                } else {
+                                    ret.add(resource);
                                 }
-                                ret.add(resource);
                             } catch (IOException e) {
                                 throw new UncheckedIOException(e);
                             }