diff --git a/pom.xml b/pom.xml
index 57543a0..299b1d0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>dev.tulis</groupId>
     <artifactId>TuliErrorer</artifactId>
-    <version>1.0-SNAPSHOT</version>
+    <version>1.1</version>
 
     <properties>
         <maven.compiler.source>21</maven.compiler.source>
@@ -31,4 +31,18 @@
             <url>https://git.tulisiowice.top/api/packages/Tulis/maven</url>
         </snapshotRepository>
     </distributionManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-core</artifactId>
+            <version>2.19.2</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.19.2</version>
+        </dependency>
+    </dependencies>
 </project>
\ No newline at end of file
diff --git a/src/main/java/dev/tulis/errorer/Errorer.java b/src/main/java/dev/tulis/errorer/Errorer.java
index f70e251..284cd2c 100644
--- a/src/main/java/dev/tulis/errorer/Errorer.java
+++ b/src/main/java/dev/tulis/errorer/Errorer.java
@@ -1,60 +1,80 @@
 package dev.tulis.errorer;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.net.URI;
+import java.net.URLEncoder;
 import java.net.http.HttpClient;
 import java.net.http.HttpRequest;
 import java.net.http.HttpResponse;
+import java.nio.charset.StandardCharsets;
 import java.time.ZoneId;
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
+import java.util.Map;
 
 public class Errorer {
     String repoPath;
     String token;
     int labelId = 1;
+    int duplicateId = 2;
+    String assignee = "Tulis";
 
     public Errorer(String repoPath, String token) {
         this.repoPath = repoPath;
         this.token = token;
     }
 
-    public Errorer(String repoPath, String token, int labelId) {
-        this.repoPath = repoPath;
-        this.token = token;
-        this.labelId = labelId;
-    }
-
     public void reportException(Exception e, Object o, String... additionalData) {
         String stackTrace = getErrorStackTrace(e);
         String className = o.getClass().getName();
+        String errorText = e.getClass().getName() + " in " + className;
 
         ZonedDateTime warsawTime = ZonedDateTime.now(ZoneId.of("Europe/Warsaw"));
 
         DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss z");
         String formattedTime = warsawTime.format(formatter);
 
-        StringBuilder description = new StringBuilder("### Error stackTrace: \n```\n");
-        description.append(stackTrace);
-        description.append("```\n\n");
-        for(String str : additionalData) {
-            description.append(str);
-            if(!additionalData[additionalData.length - 1].equals(str)) description.append(" ");
-        }
-        if(additionalData.length != 0) description.append("\n");
-        description.append("Automatically reported by TuliErrorer");
+        StringBuilder description = getDescription(e, additionalData, stackTrace);
 
         try(HttpClient client = HttpClient.newHttpClient()) {
+            boolean isDuplicate = false;
+
+            {
+                HttpRequest request = HttpRequest.newBuilder()
+                        .uri(URI.create(String.format("https://git.tulisiowice.top/api/v1/repos/%s/issues?q=%s", repoPath, URLEncoder.encode(errorText, StandardCharsets.UTF_8))))
+                        .header("Content-Type", "application/json")
+                        .header("Authorization", "token " + token)
+                        .GET()
+                        .build();
+
+                HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+                String str = response.body();
+
+                ObjectMapper mapper = new ObjectMapper();
+
+                JsonNode rootNode = mapper.readTree(str);
+                JsonNode isDuplicateNode = rootNode.at("/0");
+                if (!isDuplicateNode.isMissingNode()) isDuplicate = true;
+            }
+
             String json = String.format("""
             {
                 "title": "%s",
                 "body": "%s",
-                "assignees": ["Tulis"],
-                "labels": [1]
+                "assignees": ["%s"],
+                "labels": [%s]
             }
-            """, e.getMessage() + " in " + className + " at " + formattedTime, description);
+            """,
+                    String.format("%s %s", errorText, formattedTime),
+                    description,
+                    assignee,
+                    (isDuplicate) ? labelId + ", " + duplicateId : labelId);
+
             HttpRequest request = HttpRequest.newBuilder()
                     .uri(URI.create("https://git.tulisiowice.top/api/v1/repos/" + repoPath + "/issues"))
                     .header("Content-Type", "application/json")
@@ -68,6 +88,21 @@ public class Errorer {
         }
     }
 
+    private static StringBuilder getDescription(Exception e, String[] additionalData, String stackTrace) {
+        StringBuilder description = new StringBuilder(String.format("###%s Error stackTrace: \n```\n", (e.getMessage() == null) ? "" : String.format(" [%s]", e.getMessage())));
+        description.append(stackTrace);
+        description.append("```\n\n");
+
+        for(String str : additionalData) {
+            description.append(str);
+            if(!additionalData[additionalData.length - 1].equals(str)) description.append(" ");
+        }
+
+        if(additionalData.length != 0) description.append("\n");
+        description.append("Automatically reported by TuliErrorer");
+        return description;
+    }
+
     private String getErrorStackTrace(Exception e) {
         StringWriter sw = new StringWriter();
         PrintWriter pw = new PrintWriter(sw);
@@ -76,6 +111,22 @@ public class Errorer {
         return sw.toString();
     }
 
+    public String getAssignee() {
+        return assignee;
+    }
+
+    public void setAssignee(String assignee) {
+        this.assignee = assignee;
+    }
+
+    public int getDuplicateId() {
+        return duplicateId;
+    }
+
+    public void setDuplicateId(int duplicateId) {
+        this.duplicateId = duplicateId;
+    }
+
     public String getRepoPath() {
         return repoPath;
     }