diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff25d6f..02003b8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,9 @@
 # PMDPlugin Changelog
 
 ## [Unreleased]
+### Added
+- Support for running PMD task in background
+
 ## [1.8.27]
 ### Added
 - Support for idea 2022.x and 2023.x
diff --git a/gradle.properties b/gradle.properties
index 081970e..9ea63c7 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -3,7 +3,7 @@
 
 # pluginGroup = com.intellij.plugins.bodhi.pmd
 pluginName = PMDPlugin
-pluginVersion = 1.8.27
+pluginVersion = 1.8.28
 
 # See https://plugins.jetbrains.com/docs/intellij/build-number-ranges.html
 # for insight into build numbers and IntelliJ Platform versions.
diff --git a/src/main/java/com/intellij/plugins/bodhi/pmd/core/PMDProgressRenderer.java b/src/main/java/com/intellij/plugins/bodhi/pmd/core/PMDProgressRenderer.java
index 3864961..a9c59f2 100644
--- a/src/main/java/com/intellij/plugins/bodhi/pmd/core/PMDProgressRenderer.java
+++ b/src/main/java/com/intellij/plugins/bodhi/pmd/core/PMDProgressRenderer.java
@@ -24,10 +24,6 @@ public String defaultFileExtension() {
         return null;
     }
 
-    @Override
-    public void start() throws IOException {
-    }
-
     @Override
     public void startFileAnalysis(DataSource dataSource) {
         processedFiles++;
@@ -36,12 +32,19 @@ public void startFileAnalysis(DataSource dataSource) {
     }
 
     @Override
-    public void renderFileReport(Report report) throws IOException {
+    public void flush() {
+    }
+
+    @Override
+    public void start() throws IOException {
+    }
 
+    @Override
+    public void renderFileReport(Report report) throws IOException {
     }
 
     @Override
     public void end() throws IOException {
-
     }
+
 }
diff --git a/src/main/java/com/intellij/plugins/bodhi/pmd/core/PMDResultCollector.java b/src/main/java/com/intellij/plugins/bodhi/pmd/core/PMDResultCollector.java
index d00b97d..5b6d624 100644
--- a/src/main/java/com/intellij/plugins/bodhi/pmd/core/PMDResultCollector.java
+++ b/src/main/java/com/intellij/plugins/bodhi/pmd/core/PMDResultCollector.java
@@ -57,7 +57,6 @@ public static Report getReport() {
      *
      * @param files            The files to run PMD on
      * @param ruleSetPath      The path of the ruleSet to run
-     * @param progressRenderer
      * @return list of results
      */
     public List<PMDRuleSetEntryNode> runPMDAndGetResults(List<File> files, String ruleSetPath, PMDProjectComponent comp) {
@@ -69,7 +68,6 @@ public List<PMDRuleSetEntryNode> runPMDAndGetResults(List<File> files, String ru
      *
      * @param files       The files to run PMD on
      * @param ruleSetPath The path of the ruleSet to run
-     * @param progress    Object to report progress to
      * @return list of results
      */
     public List<PMDRuleSetEntryNode> runPMDAndGetResults(List<File> files, String ruleSetPath, PMDProjectComponent comp, PMDProgressRenderer progressRenderer) {
@@ -92,7 +90,7 @@ public List<PMDRuleSetEntryNode> runPMDAndGetResults(List<File> files, String ru
 
             PMDJsonExportingRenderer exportingRenderer = addExportRenderer(options);
             if (exportingRenderer != null) renderers.add(exportingRenderer);
-            if (progressRenderer != null) renderers.add(progressRenderer    );
+            if (progressRenderer != null) renderers.add(progressRenderer);
 
             try (PmdAnalysis pmd = PmdAnalysis.create(pmdConfig)) {
                 files.forEach(file -> pmd.files().addFile(file.toPath()));
@@ -161,7 +159,7 @@ public static String isValidRuleSet(String path) {
 
         try {
             RuleSet rs = new RuleSetLoader().loadFromResource(path);
-            if (rs.getRules().size() != 0) {
+            if (!rs.getRules().isEmpty()) {
                 pathToRuleSet.put(path, rs);
                 return "";
             }
diff --git a/src/main/java/com/intellij/plugins/bodhi/pmd/core/UselessSuppressionsHelper.java b/src/main/java/com/intellij/plugins/bodhi/pmd/core/UselessSuppressionsHelper.java
index d82518d..46420c1 100644
--- a/src/main/java/com/intellij/plugins/bodhi/pmd/core/UselessSuppressionsHelper.java
+++ b/src/main/java/com/intellij/plugins/bodhi/pmd/core/UselessSuppressionsHelper.java
@@ -34,9 +34,9 @@
  * @author jborgers
  */
 public class UselessSuppressionsHelper {
-    static final Pattern NEXT_METHOD_NAME_PATTERN = Pattern.compile("\\R*^\\s*[\\w\\s<>]+\\s+([\\w]+)\\(");
-    static final Pattern NEXT_FIELD_NAME_PATTERN = Pattern.compile("\\R*\\s*[\\w\\s<>,?]+\\s+([\\w]+)\\s*[=;]");
-    static final Pattern COMMENT_PATTERN = Pattern.compile("(\\/\\/.*|\\/\\*(?s:.)*?\\*\\/)"); // Matches single-line and multi-line comments
+    static final Pattern NEXT_METHOD_NAME_PATTERN = Pattern.compile("\\R*^\\s*[\\w\\s<>]+\\s+(\\w+)\\(");
+    static final Pattern NEXT_FIELD_NAME_PATTERN = Pattern.compile("\\R*\\s*[\\w\\s<>,?]+\\s+(\\w+)\\s*[=;]");
+    static final Pattern COMMENT_PATTERN = Pattern.compile("(//.*|/\\*(?s:.)*?\\*/)"); // Matches single-line and multi-line comments
     static final String NO_METHOD = "<nom>";
     final Map<String, Set<String>> classMethodToRuleNameOfSuppressedViolationsMap = new HashMap<>();
     final Map<String, Set<String>> classMethodToRuleNameOfViolationsMap = new HashMap<>();
@@ -55,7 +55,7 @@ public class UselessSuppressionsHelper {
 
     void storeRuleNameForMethod(Report.SuppressedViolation suppressed) {
         RuleViolation violation = suppressed.getRuleViolation();
-        if (!violation.getMethodName().isEmpty()) {
+        if (violation.getMethodName() != null && !violation.getMethodName().isEmpty()) {
             // store for method
             String methodKey = violation.getPackageName() + "-" + violation.getClassName() + "-" + violation.getMethodName();
             Set<String> suppressedMethodRuleNames = classMethodToRuleNameOfSuppressedViolationsMap.get(methodKey);
@@ -136,8 +136,6 @@ private void addNodeIfUseless(List<PMDUselessSuppression> uselessSuppressions, P
                         uselessSuppressions.add(new PMDUselessSuppression(pmdViolation, annotatedRuleName));
                     }
                 }
-            } else {
-                // cannot deal with other, non-pmd suppressions
             }
         }
     }
@@ -179,18 +177,20 @@ ViolatingAnnotationHolder getAnnotationContext(PMDViolation annotationViolation)
         if (virtualFile != null) {
             ApplicationManager.getApplication().runReadAction(() -> {
                 Document doc = FileDocumentManager.getInstance().getDocument(virtualFile);
-                int startOffset = doc.getLineStartOffset(annotationViolation.getBeginLine() - 1) + annotationViolation.getBeginColumn();
-                int endOffset = doc.getLineStartOffset(annotationViolation.getEndLine() - 1) + annotationViolation.getEndColumn() - 1;
-                String violatingAnnotation = doc.getText(new TextRange(startOffset, endOffset));
-                String methodName;
-                if (!annotationViolation.getMethodName().isEmpty()) { // an annotation inside a method
-                    methodName = annotationViolation.getMethodName();
-                } else {
-                    int startAfter = doc.getLineStartOffset(annotationViolation.getEndLine());
-                    String after = doc.getText(new TextRange(startAfter, doc.getTextLength() - 1));
-                    methodName = findMethodName(after);
+                if (doc != null) {
+                    int startOffset = doc.getLineStartOffset(annotationViolation.getBeginLine() - 1) + annotationViolation.getBeginColumn();
+                    int endOffset = doc.getLineStartOffset(annotationViolation.getEndLine() - 1) + annotationViolation.getEndColumn() - 1;
+                    String violatingAnnotation = doc.getText(new TextRange(startOffset, endOffset));
+                    String methodName;
+                    if (!annotationViolation.getMethodName().isEmpty()) { // an annotation inside a method
+                        methodName = annotationViolation.getMethodName();
+                    } else {
+                        int startAfter = doc.getLineStartOffset(annotationViolation.getEndLine());
+                        String after = doc.getText(new TextRange(startAfter, doc.getTextLength() - 1));
+                        methodName = findMethodName(after);
+                    }
+                    annotationContextResult = new ViolatingAnnotationHolder(violatingAnnotation, methodName);
                 }
-                annotationContextResult = new ViolatingAnnotationHolder(violatingAnnotation, methodName);
             });
         }
         return annotationContextResult;