diff --git a/gui/codeeditor.cpp b/gui/codeeditor.cpp
index 51eaeb7cb..bf0959529 100644
--- a/gui/codeeditor.cpp
+++ b/gui/codeeditor.cpp
@@ -49,15 +49,31 @@ Highlighter::Highlighter(QTextDocument *parent)
     rule.format = singleLineCommentFormat;
     highlightingRules.append(rule);
 
+    highlightingRulesWithSymbols = highlightingRules;
+
     multiLineCommentFormat.setForeground(Qt::gray);
 
+    symbolFormat.setForeground(Qt::red);
+    symbolFormat.setBackground(QColor(220,220,255));
+
     commentStartExpression = QRegularExpression("/\\*");
     commentEndExpression = QRegularExpression("\\*/");
 }
 
+void Highlighter::setSymbols(const QStringList &symbols)
+{
+    highlightingRulesWithSymbols = highlightingRules;
+    foreach (const QString &sym, symbols) {
+        HighlightingRule rule;
+        rule.pattern = QRegularExpression("\\b" + sym + "\\b");
+        rule.format = symbolFormat;
+        highlightingRulesWithSymbols.append(rule);
+    }
+}
+
 void Highlighter::highlightBlock(const QString &text)
 {
-    foreach (const HighlightingRule &rule, highlightingRules) {
+    foreach (const HighlightingRule &rule, highlightingRulesWithSymbols) {
         QRegularExpressionMatchIterator matchIterator = rule.pattern.globalMatch(text);
         while (matchIterator.hasNext()) {
             QRegularExpressionMatch match = matchIterator.next();
@@ -94,6 +110,8 @@ CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
     highlighter = new Highlighter(this->document());
     mErrorPosition = -1;
 
+    setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
+
     connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(updateLineNumberAreaWidth(int)));
     connect(this, SIGNAL(updateRequest(QRect,int)), this, SLOT(updateLineNumberArea(QRect,int)));
     connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(highlightCurrentLine()));
@@ -103,19 +121,25 @@ CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
 
 static int getPos(const QString &fileData, int lineNumber)
 {
+    if (lineNumber <= 1)
+        return 0;
     for (int pos = 0, line = 1; pos < fileData.size(); ++pos) {
         if (fileData[pos] != '\n')
             continue;
         ++line;
-        if (line == lineNumber)
+        if (line >= lineNumber)
             return pos + 1;
     }
     return fileData.size();
 }
 
-void CodeEditor::setErrorLine(int errorLine)
+void CodeEditor::setError(const QString &code, int errorLine, const QStringList &symbols)
 {
-    mErrorPosition = getPos(toPlainText(), errorLine);
+    highlighter->setSymbols(symbols);
+
+    setPlainText(code);
+
+    mErrorPosition = getPos(code, errorLine);
     QTextCursor tc = textCursor();
     tc.setPosition(mErrorPosition);
     setTextCursor(tc);
diff --git a/gui/codeeditor.h b/gui/codeeditor.h
index 41d555016..352bb4b58 100644
--- a/gui/codeeditor.h
+++ b/gui/codeeditor.h
@@ -20,6 +20,8 @@ class Highlighter : public QSyntaxHighlighter {
 public:
     explicit Highlighter(QTextDocument *parent);
 
+    void setSymbols(const QStringList &symbols);
+
 protected:
     void highlightBlock(const QString &text) override;
 
@@ -29,6 +31,7 @@ private:
         QTextCharFormat format;
     };
     QVector<HighlightingRule> highlightingRules;
+    QVector<HighlightingRule> highlightingRulesWithSymbols;
 
     QRegularExpression commentStartExpression;
     QRegularExpression commentEndExpression;
@@ -39,6 +42,7 @@ private:
     QTextCharFormat multiLineCommentFormat;
     QTextCharFormat quotationFormat;
     QTextCharFormat functionFormat;
+    QTextCharFormat symbolFormat;
 };
 
 class CodeEditor : public QPlainTextEdit {
@@ -50,7 +54,7 @@ public:
     void lineNumberAreaPaintEvent(QPaintEvent *event);
     int lineNumberAreaWidth();
 
-    void setErrorLine(int errorLine);
+    void setError(const QString &code, int errorLine, const QStringList &symbols);
 
 protected:
     void resizeEvent(QResizeEvent *event) override;
diff --git a/gui/resultsview.cpp b/gui/resultsview.cpp
index 00ad6177f..8dd13b64d 100644
--- a/gui/resultsview.cpp
+++ b/gui/resultsview.cpp
@@ -406,9 +406,16 @@ void ResultsView::updateDetails(const QModelIndex &index)
 
     QFile file(filepath);
     if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        QStringList symbols;
+        QRegularExpression re(".*: ([A-Za-z_][A-Za-z0-9_]*)$");
+        const QString errorMessage = data["message"].toString();
+        QRegularExpressionMatch match = re.match(errorMessage);
+        if (match.hasMatch()) {
+            symbols << match.captured(1);
+        }
+
         QTextStream in(&file);
-        mUI.mCode->setPlainText(in.readAll());
-        mUI.mCode->setErrorLine(lineNumber);
+        mUI.mCode->setError(in.readAll(), lineNumber, symbols);
     }
 }