diff --git a/gui/resultstree.cpp b/gui/resultstree.cpp
index 53f4a5f9ab9..78d56929b48 100644
--- a/gui/resultstree.cpp
+++ b/gui/resultstree.cpp
@@ -239,6 +239,11 @@ bool ResultsTree::addErrorItem(const ErrorItem& errorItem)
     if (errorItem.errorPath.isEmpty())
         return false;
 
+    const QString s = errorItem.toString();
+    if (mErrorList.contains(s))
+        return false;
+    mErrorList.append(s);
+
     QSharedPointer<ErrorItem> errorItemPtr{new ErrorItem(errorItem)};
 
     if (mReportType != ReportType::normal) {
@@ -393,6 +398,8 @@ ResultItem *ResultsTree::findFileItem(const QString &name) const
 
 void ResultsTree::clear()
 {
+    mErrorList.clear();
+
     mModel->removeRows(0, mModel->rowCount());
 
     if (const ProjectFile *activeProject = ProjectFile::getActiveProject()) {
@@ -419,6 +426,7 @@ void ResultsTree::clear(const QString &filename)
         if (stripped == fileItem->text() ||
             filename == fileItem->errorItem->file0) {
             mModel->removeRow(i);
+            mErrorList.removeAll(fileItem->errorItem->toString());
             break;
         }
     }
@@ -436,6 +444,7 @@ void ResultsTree::clearRecheckFile(const QString &filename)
         storedfile = ((!mCheckPath.isEmpty() && storedfile.startsWith(mCheckPath)) ? storedfile.mid(mCheckPath.length() + 1) : storedfile);
         if (actualfile == storedfile) {
             mModel->removeRow(i);
+            mErrorList.removeAll(fileItem->errorItem->toString());
             break;
         }
     }
diff --git a/gui/resultstree.h b/gui/resultstree.h
index 9537d6d929a..87907bc5d95 100644
--- a/gui/resultstree.h
+++ b/gui/resultstree.h
@@ -568,6 +568,9 @@ protected slots:
 
     QStringList mHiddenMessageId;
 
+    // List of existing errors so we can avoid duplicates
+    QStringList mErrorList;
+
     QItemSelectionModel* mSelectionModel{};
     ThreadHandler *mThread{};
 
diff --git a/gui/test/resultstree/testresultstree.cpp b/gui/test/resultstree/testresultstree.cpp
index be09034609f..8208ca0343e 100644
--- a/gui/test/resultstree/testresultstree.cpp
+++ b/gui/test/resultstree/testresultstree.cpp
@@ -134,6 +134,19 @@ void TestResultsTree::test1() const
     QCOMPARE(tree.isRowHidden(0,QModelIndex()), false); // Show item
 }
 
+void TestResultsTree::duplicateResults() const
+{
+    // #14359 - filter out duplicate warnings
+    ResultsTree tree(nullptr);
+
+    ErrorItem errorItem;
+    errorItem.summary = errorItem.message = "test";
+    errorItem.severity = Severity::error;
+    errorItem.errorPath << QErrorPathItem();
+    QVERIFY(tree.addErrorItem(errorItem));
+    QVERIFY(!tree.addErrorItem(errorItem));
+}
+
 static QErrorPathItem createErrorPathItem(QString file, int line, int column, QString info) {
     QErrorPathItem ret;
     ret.file = std::move(file);
diff --git a/gui/test/resultstree/testresultstree.h b/gui/test/resultstree/testresultstree.h
index 1e743581bac..108ed098eb5 100644
--- a/gui/test/resultstree/testresultstree.h
+++ b/gui/test/resultstree/testresultstree.h
@@ -23,6 +23,7 @@ class TestResultsTree : public QObject {
 
 private slots:
     void test1() const;
+    void duplicateResults() const;
     void multiLineResult() const;
     void resultsInSameFile() const;
     void testReportType() const;