diff --git a/labyrinth-server.iml b/labyrinth-server.iml
index 8d460f3..9a37eeb 100644
--- a/labyrinth-server.iml
+++ b/labyrinth-server.iml
@@ -12,7 +12,7 @@
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Maven: ch.fritteli.labyrinth:labyrinth-generator:0.0.1" level="project" />
+    <orderEntry type="module" module-name="labyrinth-generator" />
     <orderEntry type="library" name="Maven: org.apache.pdfbox:pdfbox:2.0.20" level="project" />
     <orderEntry type="library" name="Maven: org.apache.pdfbox:fontbox:2.0.20" level="project" />
     <orderEntry type="library" name="Maven: commons-logging:commons-logging:1.2" level="project" />
diff --git a/pom.xml b/pom.xml
index b18d2cf..3a3f0b1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,7 +18,7 @@
 		<dependency>
 			<groupId>ch.fritteli.labyrinth</groupId>
 			<artifactId>labyrinth-generator</artifactId>
-			<version>0.0.1</version>
+			<version>0.0.2-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>io.vavr</groupId>
diff --git a/src/main/java/ch/fritteli/labyrinth/server/LabyrinthServer.java b/src/main/java/ch/fritteli/labyrinth/server/LabyrinthServer.java
index 0eb2530..bcb6bd4 100644
--- a/src/main/java/ch/fritteli/labyrinth/server/LabyrinthServer.java
+++ b/src/main/java/ch/fritteli/labyrinth/server/LabyrinthServer.java
@@ -7,12 +7,7 @@ import ch.fritteli.labyrinth.generator.renderer.text.TextRenderer;
 import com.sun.net.httpserver.Headers;
 import com.sun.net.httpserver.HttpExchange;
 import com.sun.net.httpserver.HttpServer;
-import io.vavr.collection.HashMap;
-import io.vavr.collection.HashSet;
-import io.vavr.collection.List;
-import io.vavr.collection.Map;
-import io.vavr.collection.Set;
-import io.vavr.collection.Stream;
+import io.vavr.collection.*;
 import io.vavr.control.Option;
 import io.vavr.control.Try;
 import lombok.Getter;
@@ -82,7 +77,7 @@ public class LabyrinthServer {
     public void start() {
         Runtime.getRuntime().addShutdownHook(new Thread(this::stop, "listener-stopper"));
         this.httpServer.start();
-        log.info("Listening on {}", this.httpServer.getAddress());
+        log.info("Listening on http://{}:{}", this.httpServer.getAddress().getHostString(), this.httpServer.getAddress().getPort());
     }
 
     public void stop() {
@@ -101,8 +96,8 @@ public class LabyrinthServer {
             return;
         }
         final Map<RequestParameter, String> requestParams = this.parseQueryString(exchange.getRequestURI().getQuery());
-        final int width = this.getOrDefault(requestParams.get(RequestParameter.WIDTH), Integer::valueOf, 1);
-        final int height = this.getOrDefault(requestParams.get(RequestParameter.HEIGHT), Integer::valueOf, 1);
+        final int width = this.getOrDefault(requestParams.get(RequestParameter.WIDTH), Integer::valueOf, 5);
+        final int height = this.getOrDefault(requestParams.get(RequestParameter.HEIGHT), Integer::valueOf, 5);
         final Option<Long> idOption = requestParams.get(RequestParameter.ID).toTry().map(Long::valueOf).toOption();
         final Option<OutputType> outputOption = requestParams.get(RequestParameter.OUTPUT).flatMap(OutputType::ofString);
         final Headers responseHeaders = exchange.getResponseHeaders();
@@ -115,10 +110,21 @@ public class LabyrinthServer {
             exchange.close();
             return;
         }
+        final Labyrinth labyrinth = new Labyrinth(width, height, id);
+        final byte[] render;
+        try {
+            render = output.render(labyrinth);
+        } catch (Exception e) {
+            responseHeaders.add("Content-type", "text/plain; charset=UTF-8");
+            exchange.sendResponseHeaders(500, 0);
+            final OutputStream responseBody = exchange.getResponseBody();
+            responseBody.write(("Error: " + e).getBytes(StandardCharsets.UTF_8));
+            responseBody.flush();
+            exchange.close();
+            return;
+        }
         responseHeaders.add("Content-type", output.getContentType());
         exchange.sendResponseHeaders(200, 0);
-        final Labyrinth labyrinth = new Labyrinth(width, height, id);
-        final byte[] render = output.render(labyrinth);
         final OutputStream responseBody = exchange.getResponseBody();
         responseBody.write(render);
         responseBody.flush();